Improve layout of documentation page and add search feature (#8247)

* Improve layout of documentation page and add search feature

Closes https://github.com/FreshRSS/FreshRSS/issues/7915, https://github.com/FreshRSS/FreshRSS/issues/5325

Also: anchor headings and fix building site locally

* Further improvements

* Set color of hyperlinks
* Consistent styling of close aside button across devices
* Mobile layout 600px -> 1200px
* Add suffix to docs `<title>`
    * Note: titles of pages probably need to be improved, since currently they are just derived from the names of the first heading on every page
* Add favicon

* Improve font

* Try to fix favicon not loading correctly on GH pages

* Use local font

* Attempt to fix GH pages

* Final improvements

* Copy to clipboard button
* Support for nojs search
* Dark mode
* Load search.json (200KB json) only on search input focus
* Keep scroll state of sidebar across navigations

* Clickable images and CSP

CSP so we avoid hotlinking resources and clickable images are useful for zooming on mobile for example

* Fix typos

* Disable Dark Reader extension if dark mode CSS is loaded

* Support internationalisation (via language dropdown)

* Add Gemfile.lock

* Make CI build work with the custom plugin

* Make menus closable with Esc

* Fix typos CI

* Suggestions

* Use `ruby/setup-ruby` action in workflow for installing and caching gems.

* Run build only when there are changes to `docs/`

See: https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows?versionId=free-pro-team%40latest&productId=actions#running-your-workflow-only-when-a-push-to-specific-branches-occurs

* Change font to `Open Sans`

* Increase line height

* Fix Liquid syntax error

5 files changed, 1255 insertions, 11 deletions

diff --git a/docs/assets/css/darkmode.css b/docs/assets/css/darkmode.css
new file mode 100644
index 000000000..371ff1a2b
--- /dev/null
+++ b/docs/assets/css/darkmode.css
@@ -0,0 +1,620 @@
+/* stylelint-disable */
+/*! Dark reader generated CSS | Licensed under MIT https://github.com/darkreader/darkreader/blob/main/LICENSE */
+
+/* User-Agent Style */
+@layer {
+html {
+    background-color: var(--darkreader-background-ffffff, #181a1b) !important;
+}
+html {
+    color-scheme: dark !important;
+}
+iframe {
+    color-scheme: dark !important;
+}
+html, body {
+    background-color: var(--darkreader-background-ffffff, #181a1b);
+}
+html, body {
+    border-color: var(--darkreader-border-4c4c4c, #736b5e);
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+a {
+    color: var(--darkreader-text-0040ff, #3391ff);
+}
+table {
+    border-color: var(--darkreader-border-808080, #545b5e);
+}
+mark {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+::placeholder {
+    color: var(--darkreader-text-a9a9a9, #b2aba1);
+}
+input:-webkit-autofill,
+textarea:-webkit-autofill,
+select:-webkit-autofill {
+    background-color: var(--darkreader-background-faffbd, #404400) !important;
+    color: var(--darkreader-text-000000, #e8e6e3) !important;
+}
+::selection {
+    background-color: var(--darkreader-background-0060d4, #004daa) !important;
+    color: var(--darkreader-text-ffffff, #e8e6e3) !important;
+}
+::-moz-selection {
+    background-color: var(--darkreader-background-0060d4, #004daa) !important;
+    color: var(--darkreader-text-ffffff, #e8e6e3) !important;
+}
+}
+
+/* Variables Style */
+:root {
+   --darkreader-neutral-background: var(--darkreader-background-ffffff, #181a1b);
+   --darkreader-neutral-text: var(--darkreader-text-000000, #e8e6e3);
+   --darkreader-selection-background: var(--darkreader-background-0060d4, #004daa);
+   --darkreader-selection-text: var(--darkreader-text-ffffff, #e8e6e3);
+}
+
+/* Modified CSS */
+:root {
+    --aside-width: 300px;
+}
+aside {
+    border-right-color: var(--darkreader-border-000000, #8c8273);
+}
+section.search {
+    border-bottom-color: var(--darkreader-border-000000, #8c8273);
+}
+div.lang-dropdown:target nav {
+    background-color: var(--darkreader-background-ffffff, #181a1b);
+    border-bottom-color: var(--darkreader-border-000000, #8c8273);
+    border-left-color: var(--darkreader-border-000000, #8c8273);
+    border-right-color: var(--darkreader-border-000000, #8c8273);
+    border-top-color: var(--darkreader-border-000000, #8c8273);
+}
+div.lang-dropdown:target nav a:hover {
+    background-color: var(--darkreader-background-c0c0c0, #3c4143);
+}
+@media (max-width: 1200px) {
+    body:has(aside:target) > a.close {
+        background-color: var(--darkreader-background-000000, #000000);
+    }
+    aside:target {
+        background-color: var(--darkreader-background-ffffff, #181a1b);
+    }
+    nav.mobile-nav {
+        border-bottom-color: var(--darkreader-border-000000, #8c8273);
+    }
+    nav.mobile-nav > a.toggle-aside {
+        color: var(--darkreader-text-000000, #e8e6e3);
+    }
+}
+a {
+    color: var(--darkreader-text-0000ee, #3d84ff);
+    text-decoration-color: currentcolor;
+}
+aside a.close {
+    color: var(--darkreader-text-ff0000, #ff1a1a);
+}
+table,
+th,
+tr,
+td {
+    border-bottom-color: var(--darkreader-border-000000, #8c8273);
+    border-left-color: var(--darkreader-border-000000, #8c8273);
+    border-right-color: var(--darkreader-border-000000, #8c8273);
+    border-top-color: var(--darkreader-border-000000, #8c8273);
+}
+a.lang-btn {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .cm {
+    color: var(--darkreader-text-999988, #a29a8e);
+}
+.highlight .cp {
+    color: var(--darkreader-text-999999, #a8a095);
+}
+.highlight .c1 {
+    color: var(--darkreader-text-999988, #a29a8e);
+}
+.highlight .cs {
+    color: var(--darkreader-text-999999, #a8a095);
+}
+.highlight .c,
+.highlight .ch,
+.highlight .cd,
+.highlight .cpf {
+    color: var(--darkreader-text-999988, #a29a8e);
+}
+.highlight .err {
+    background-color: var(--darkreader-background-e3d2d2, #3a2424);
+    color: var(--darkreader-text-a61717, #e95e5e);
+}
+.highlight .gd {
+    background-color: var(--darkreader-background-ffdddd, #470000);
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .ge {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .gr {
+    color: var(--darkreader-text-aa0000, #ff5555);
+}
+.highlight .gh {
+    color: var(--darkreader-text-999999, #a8a095);
+}
+.highlight .gi {
+    background-color: var(--darkreader-background-ddffdd, #124700);
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .go {
+    color: var(--darkreader-text-888888, #9d9488);
+}
+.highlight .gp {
+    color: var(--darkreader-text-555555, #b2aca2);
+}
+.highlight .gu {
+    color: var(--darkreader-text-aaaaaa, #b2aca2);
+}
+.highlight .gt {
+    color: var(--darkreader-text-aa0000, #ff5555);
+}
+.highlight .kc {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .kd {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .kn {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .kp {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .kr {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .kt {
+    color: var(--darkreader-text-445588, #8ba6c5);
+}
+.highlight .k,
+.highlight .kv {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .mf {
+    color: var(--darkreader-text-009999, #61ffff);
+}
+.highlight .mh {
+    color: var(--darkreader-text-009999, #61ffff);
+}
+.highlight .il {
+    color: var(--darkreader-text-009999, #61ffff);
+}
+.highlight .mi {
+    color: var(--darkreader-text-009999, #61ffff);
+}
+.highlight .mo {
+    color: var(--darkreader-text-009999, #61ffff);
+}
+.highlight .m,
+.highlight .mb,
+.highlight .mx {
+    color: var(--darkreader-text-009999, #61ffff);
+}
+.highlight .sa {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .sb {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .sc {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .sd {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .s2 {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .se {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .sh {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .si {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .sx {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .sr {
+    color: var(--darkreader-text-009926, #61ff88);
+}
+.highlight .s1 {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .ss {
+    color: var(--darkreader-text-990073, #ff61d8);
+}
+.highlight .s,
+.highlight .dl {
+    color: var(--darkreader-text-dd1144, #ef3564);
+}
+.highlight .na {
+    color: var(--darkreader-text-008080, #72ffff);
+}
+.highlight .bp {
+    color: var(--darkreader-text-999999, #a8a095);
+}
+.highlight .nb {
+    color: var(--darkreader-text-0086b3, #4fd3ff);
+}
+.highlight .nc {
+    color: var(--darkreader-text-445588, #8ba6c5);
+}
+.highlight .no {
+    color: var(--darkreader-text-008080, #72ffff);
+}
+.highlight .nd {
+    color: var(--darkreader-text-3c5d5d, #b8b2a8);
+}
+.highlight .ni {
+    color: var(--darkreader-text-800080, #ff72ff);
+}
+.highlight .ne {
+    color: var(--darkreader-text-990000, #ff6161);
+}
+.highlight .nf,
+.highlight .fm {
+    color: var(--darkreader-text-990000, #ff6161);
+}
+.highlight .nl {
+    color: var(--darkreader-text-990000, #ff6161);
+}
+.highlight .nn {
+    color: var(--darkreader-text-555555, #b2aca2);
+}
+.highlight .nt {
+    color: var(--darkreader-text-000080, #7faeff);
+}
+.highlight .vc {
+    color: var(--darkreader-text-008080, #72ffff);
+}
+.highlight .vg {
+    color: var(--darkreader-text-008080, #72ffff);
+}
+.highlight .vi {
+    color: var(--darkreader-text-008080, #72ffff);
+}
+.highlight .nv,
+.highlight .vm {
+    color: var(--darkreader-text-008080, #72ffff);
+}
+.highlight .ow {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .o {
+    color: var(--darkreader-text-000000, #e8e6e3);
+}
+.highlight .w {
+    color: var(--darkreader-text-bbbbbb, #bdb7af);
+}
+.highlight {
+    background-color: var(--darkreader-background-f8f8f8, #1c1e1f);
+}
+a {
+    background-color: transparent;
+}
+abbr[title] {
+    border-bottom-color: currentcolor;
+    text-decoration-color: currentcolor;
+}
+button:focus-visible,
+[type="button"]:focus-visible,
+[type="reset"]:focus-visible,
+[type="submit"]:focus-visible {
+    outline-color: var(--darkreader-border-000000, #8c8273);
+}
+legend {
+    color: inherit;
+}
+@layer  {
+    html {
+        background-color: var(--darkreader-bg--darkreader-background-ffffff, var(--darkreader-background-181a1b, #131516)) !important;
+    }
+    html {
+        color-scheme: dark !important;
+    }
+    iframe {
+        color-scheme: dark !important;
+    }
+    html,
+    body {
+        background-color: var(--darkreader-bg--darkreader-background-ffffff, var(--darkreader-background-181a1b, #131516));
+    }
+    html,
+    body {
+        border-color: var(--darkreader-border--darkreader-border-4c4c4c, var(--darkreader-border-736b5e, #6a6257));
+        color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+    }
+    a {
+        color: var(--darkreader-text--darkreader-text-0040ff, var(--darkreader-text-3391ff, #3da5ff));
+    }
+    table {
+        border-color: var(--darkreader-border--darkreader-border-808080, var(--darkreader-border-545b5e, #6f675b));
+    }
+    mark {
+        color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+    }
+    ::placeholder {
+        color: var(--darkreader-text--darkreader-text-a9a9a9, var(--darkreader-text-b2aba1, #b2aba1));
+    }
+    input:autofill,
+    textarea:autofill,
+    select:autofill {
+        background-color: var(--darkreader-bg--darkreader-background-faffbd, var(--darkreader-background-404400, #333600)) !important;
+        color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf)) !important;
+    }
+    ::selection {
+        background-color: var(--darkreader-bg--darkreader-background-0060d4, var(--darkreader-background-004daa, #003e88)) !important;
+        color: var(--darkreader-text--darkreader-text-ffffff, var(--darkreader-text-e8e6e3, #d8d4cf)) !important;
+    }
+    ::selection {
+        background-color: var(--darkreader-bg--darkreader-background-0060d4, var(--darkreader-background-004daa, #003e88)) !important;
+        color: var(--darkreader-text--darkreader-text-ffffff, var(--darkreader-text-e8e6e3, #d8d4cf)) !important;
+    }
+}
+:root {
+    --darkreader-neutral-background: var(--darkreader-background-ffffff, #181a1b);
+    --darkreader-neutral-text: var(--darkreader-text-000000, #e8e6e3);
+    --darkreader-selection-background: var(--darkreader-background-0060d4, #004daa);
+    --darkreader-selection-text: var(--darkreader-text-ffffff, #e8e6e3);
+}
+:root {
+    --aside-width: 300px;
+}
+aside {
+    border-right-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+}
+section.search {
+    border-bottom-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+}
+@media (max-width: 1200px) {
+    body:has(aside:target) > a#close {
+        background-color: var(--darkreader-bg--darkreader-background-000000, var(--darkreader-background-000000, #000000));
+    }
+    aside:target {
+        background-color: var(--darkreader-bg--darkreader-background-ffffff, var(--darkreader-background-181a1b, #131516));
+    }
+    nav.mobile-nav {
+        border-bottom-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+    }
+}
+a {
+    color: var(--darkreader-text--darkreader-text-0000ee, var(--darkreader-text-3d84ff, #44a2ff));
+    text-decoration-color: currentcolor;
+}
+aside a#close {
+    color: var(--darkreader-text--darkreader-text-ff0000, var(--darkreader-text-ff1a1a, #ff2c2c));
+}
+table,
+th,
+tr,
+td {
+    border-bottom-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+    border-left-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+    border-right-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+    border-top-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+}
+.highlight .cm {
+    color: var(--darkreader-text--darkreader-text-999988, var(--darkreader-text-a29a8e, #a79f94));
+}
+.highlight .cp {
+    color: var(--darkreader-text--darkreader-text-999999, var(--darkreader-text-a8a095, #aba499));
+}
+.highlight .c1 {
+    color: var(--darkreader-text--darkreader-text-999988, var(--darkreader-text-a29a8e, #a79f94));
+}
+.highlight .cs {
+    color: var(--darkreader-text--darkreader-text-999999, var(--darkreader-text-a8a095, #aba499));
+}
+.highlight .c,
+.highlight .ch,
+.highlight .cd,
+.highlight .cpf {
+    color: var(--darkreader-text--darkreader-text-999988, var(--darkreader-text-a29a8e, #a79f94));
+}
+.highlight .err {
+    background-color: var(--darkreader-bg--darkreader-background-e3d2d2, var(--darkreader-background-3a2424, #2e1d1d));
+    color: var(--darkreader-text--darkreader-text-a61717, var(--darkreader-text-e95e5e, #e96161));
+}
+.highlight .gd {
+    background-color: var(--darkreader-bg--darkreader-background-ffdddd, var(--darkreader-background-470000, #390000));
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .ge {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .gr {
+    color: var(--darkreader-text--darkreader-text-aa0000, var(--darkreader-text-ff5555, #ff5555));
+}
+.highlight .gh {
+    color: var(--darkreader-text--darkreader-text-999999, var(--darkreader-text-a8a095, #aba499));
+}
+.highlight .gi {
+    background-color: var(--darkreader-bg--darkreader-background-ddffdd, var(--darkreader-background-124700, #0e3900));
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .go {
+    color: var(--darkreader-text--darkreader-text-888888, var(--darkreader-text-9d9488, #a39c90));
+}
+.highlight .gp {
+    color: var(--darkreader-text--darkreader-text-555555, var(--darkreader-text-b2aca2, #b2aca2));
+}
+.highlight .gu {
+    color: var(--darkreader-text--darkreader-text-aaaaaa, var(--darkreader-text-b2aca2, #b2aca2));
+}
+.highlight .gt {
+    color: var(--darkreader-text--darkreader-text-aa0000, var(--darkreader-text-ff5555, #ff5555));
+}
+.highlight .kc {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .kd {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .kn {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .kp {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .kr {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .kt {
+    color: var(--darkreader-text--darkreader-text-445588, var(--darkreader-text-8ba6c5, #8cabc5));
+}
+.highlight .k,
+.highlight .kv {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .mf {
+    color: var(--darkreader-text--darkreader-text-009999, var(--darkreader-text-61ffff, #5dffff));
+}
+.highlight .mh {
+    color: var(--darkreader-text--darkreader-text-009999, var(--darkreader-text-61ffff, #5dffff));
+}
+.highlight .il {
+    color: var(--darkreader-text--darkreader-text-009999, var(--darkreader-text-61ffff, #5dffff));
+}
+.highlight .mi {
+    color: var(--darkreader-text--darkreader-text-009999, var(--darkreader-text-61ffff, #5dffff));
+}
+.highlight .mo {
+    color: var(--darkreader-text--darkreader-text-009999, var(--darkreader-text-61ffff, #5dffff));
+}
+.highlight .m,
+.highlight .mb,
+.highlight .mx {
+    color: var(--darkreader-text--darkreader-text-009999, var(--darkreader-text-61ffff, #5dffff));
+}
+.highlight .sa {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .sb {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .sc {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .sd {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .s2 {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .se {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .sh {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .si {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .sx {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .sr {
+    color: var(--darkreader-text--darkreader-text-009926, var(--darkreader-text-61ff88, #5dff85));
+}
+.highlight .s1 {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .ss {
+    color: var(--darkreader-text--darkreader-text-990073, var(--darkreader-text-ff61d8, #ff5dd7));
+}
+.highlight .s,
+.highlight .dl {
+    color: var(--darkreader-text--darkreader-text-dd1144, var(--darkreader-text-ef3564, #f0426e));
+}
+.highlight .na {
+    color: var(--darkreader-text--darkreader-text-008080, var(--darkreader-text-72ffff, #69ffff));
+}
+.highlight .bp {
+    color: var(--darkreader-text--darkreader-text-999999, var(--darkreader-text-a8a095, #aba499));
+}
+.highlight .nb {
+    color: var(--darkreader-text--darkreader-text-0086b3, var(--darkreader-text-4fd3ff, #51d3ff));
+}
+.highlight .nc {
+    color: var(--darkreader-text--darkreader-text-445588, var(--darkreader-text-8ba6c5, #8cabc5));
+}
+.highlight .no {
+    color: var(--darkreader-text--darkreader-text-008080, var(--darkreader-text-72ffff, #69ffff));
+}
+.highlight .nd {
+    color: var(--darkreader-text--darkreader-text-3c5d5d, var(--darkreader-text-b8b2a8, #b6b0a6));
+}
+.highlight .ni {
+    color: var(--darkreader-text--darkreader-text-800080, var(--darkreader-text-ff72ff, #ff69ff));
+}
+.highlight .ne {
+    color: var(--darkreader-text--darkreader-text-990000, var(--darkreader-text-ff6161, #ff5d5d));
+}
+.highlight .nf,
+.highlight .fm {
+    color: var(--darkreader-text--darkreader-text-990000, var(--darkreader-text-ff6161, #ff5d5d));
+}
+.highlight .nl {
+    color: var(--darkreader-text--darkreader-text-990000, var(--darkreader-text-ff6161, #ff5d5d));
+}
+.highlight .nn {
+    color: var(--darkreader-text--darkreader-text-555555, var(--darkreader-text-b2aca2, #b2aca2));
+}
+.highlight .nt {
+    color: var(--darkreader-text--darkreader-text-000080, var(--darkreader-text-7faeff, #72b9ff));
+}
+.highlight .vc {
+    color: var(--darkreader-text--darkreader-text-008080, var(--darkreader-text-72ffff, #69ffff));
+}
+.highlight .vg {
+    color: var(--darkreader-text--darkreader-text-008080, var(--darkreader-text-72ffff, #69ffff));
+}
+.highlight .vi {
+    color: var(--darkreader-text--darkreader-text-008080, var(--darkreader-text-72ffff, #69ffff));
+}
+.highlight .nv,
+.highlight .vm {
+    color: var(--darkreader-text--darkreader-text-008080, var(--darkreader-text-72ffff, #69ffff));
+}
+.highlight .ow {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .o {
+    color: var(--darkreader-text--darkreader-text-000000, var(--darkreader-text-e8e6e3, #d8d4cf));
+}
+.highlight .w {
+    color: var(--darkreader-text--darkreader-text-bbbbbb, var(--darkreader-text-bdb7af, #bab4ab));
+}
+.highlight {
+    background-color: var(--darkreader-bg--darkreader-background-f8f8f8, var(--darkreader-background-1c1e1f, #161819));
+}
+a {
+    background-color: transparent;
+}
+abbr[title] {
+    border-bottom-color: currentcolor;
+    text-decoration-color: currentcolor;
+}
+button:focus-visible,
+[type="button"]:focus-visible,
+[type="reset"]:focus-visible,
+[type="submit"]:focus-visible {
+    outline-color: var(--darkreader-border--darkreader-border-000000, var(--darkreader-border-8c8273, #545b5f));
+}
+legend {
+    color: inherit;
+}
diff --git a/docs/assets/css/docs.css b/docs/assets/css/docs.css
new file mode 100644
index 000000000..05a407784
--- /dev/null
+++ b/docs/assets/css/docs.css
@@ -0,0 +1,3 @@
+---
+---
+{% include docs.css %}
diff --git a/docs/assets/css/highlight.css b/docs/assets/css/highlight.css
new file mode 100644
index 000000000..6b5c4b725
--- /dev/null
+++ b/docs/assets/css/highlight.css
@@ -0,0 +1,282 @@
+pre.highlight {
+	padding: 1rem;
+	overflow-x: scroll;
+}
+
+/* generated with `rougify style github` */
+.highlight table td { padding: 5px; }
+
+.highlight table pre { margin: 0; }
+
+.highlight .cm {
+	color: #998;
+	font-style: italic;
+}
+
+.highlight .cp {
+	color: #999;
+	font-weight: bold;
+}
+
+.highlight .c1 {
+	color: #998;
+	font-style: italic;
+}
+
+.highlight .cs {
+	color: #999;
+	font-weight: bold;
+	font-style: italic;
+}
+
+.highlight .c, .highlight .ch, .highlight .cd, .highlight .cpf {
+	color: #998;
+	font-style: italic;
+}
+
+.highlight .err {
+	color: #a61717;
+	background-color: #e3d2d2;
+}
+
+.highlight .gd {
+	color: #000;
+	background-color: #fdd;
+}
+
+.highlight .ge {
+	color: #000;
+	font-style: italic;
+}
+
+.highlight .gr {
+	color: #a00;
+}
+
+.highlight .gh {
+	color: #999;
+}
+
+.highlight .gi {
+	color: #000;
+	background-color: #dfd;
+}
+
+.highlight .go {
+	color: #888;
+}
+
+.highlight .gp {
+	color: #555;
+}
+
+.highlight .gs {
+	font-weight: bold;
+}
+
+.highlight .gu {
+	color: #aaa;
+}
+
+.highlight .gt {
+	color: #a00;
+}
+
+.highlight .kc {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .kd {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .kn {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .kp {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .kr {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .kt {
+	color: #458;
+	font-weight: bold;
+}
+
+.highlight .k, .highlight .kv {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .mf {
+	color: #099;
+}
+
+.highlight .mh {
+	color: #099;
+}
+
+.highlight .il {
+	color: #099;
+}
+
+.highlight .mi {
+	color: #099;
+}
+
+.highlight .mo {
+	color: #099;
+}
+
+.highlight .m, .highlight .mb, .highlight .mx {
+	color: #099;
+}
+
+.highlight .sa {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .sb {
+	color: #d14;
+}
+
+.highlight .sc {
+	color: #d14;
+}
+
+.highlight .sd {
+	color: #d14;
+}
+
+.highlight .s2 {
+	color: #d14;
+}
+
+.highlight .se {
+	color: #d14;
+}
+
+.highlight .sh {
+	color: #d14;
+}
+
+.highlight .si {
+	color: #d14;
+}
+
+.highlight .sx {
+	color: #d14;
+}
+
+.highlight .sr {
+	color: #009926;
+}
+
+.highlight .s1 {
+	color: #d14;
+}
+
+.highlight .ss {
+	color: #990073;
+}
+
+.highlight .s, .highlight .dl {
+	color: #d14;
+}
+
+.highlight .na {
+	color: #008080;
+}
+
+.highlight .bp {
+	color: #999;
+}
+
+.highlight .nb {
+	color: #0086b3;
+}
+
+.highlight .nc {
+	color: #458;
+	font-weight: bold;
+}
+
+.highlight .no {
+	color: #008080;
+}
+
+.highlight .nd {
+	color: #3c5d5d;
+	font-weight: bold;
+}
+
+.highlight .ni {
+	color: #800080;
+}
+
+.highlight .ne {
+	color: #900;
+	font-weight: bold;
+}
+
+.highlight .nf, .highlight .fm {
+	color: #900;
+	font-weight: bold;
+}
+
+.highlight .nl {
+	color: #900;
+	font-weight: bold;
+}
+
+.highlight .nn {
+	color: #555;
+}
+
+.highlight .nt {
+	color: #000080;
+}
+
+.highlight .vc {
+	color: #008080;
+}
+
+.highlight .vg {
+	color: #008080;
+}
+
+.highlight .vi {
+	color: #008080;
+}
+
+.highlight .nv, .highlight .vm {
+	color: #008080;
+}
+
+.highlight .ow {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .o {
+	color: #000;
+	font-weight: bold;
+}
+
+.highlight .w {
+	color: #bbb;
+}
+
+.highlight {
+	background-color: #f8f8f8;
+}
diff --git a/docs/assets/css/normalize.css b/docs/assets/css/normalize.css
new file mode 100644
index 000000000..bcc16e96b
--- /dev/null
+++ b/docs/assets/css/normalize.css
@@ -0,0 +1,350 @@
+/* stylelint-disable */
+/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+
+/* Document
+   ========================================================================== */
+
+/**
+ * 1. Correct the line height in all browsers.
+ * 2. Prevent adjustments of font size after orientation changes in iOS.
+ */
+
+html {
+  line-height: 1.15; /* 1 */
+  -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/* Sections
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers.
+ */
+
+body {
+  margin: 0;
+}
+
+/**
+ * Render the `main` element consistently in IE.
+ */
+
+main {
+  display: block;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+pre {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * Remove the gray background on active links in IE 10.
+ */
+
+a {
+  background-color: transparent;
+}
+
+/**
+ * 1. Remove the bottom border in Chrome 57-
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+  border-bottom: none; /* 1 */
+  text-decoration: underline; /* 2 */
+  text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+samp {
+  /* font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove the border on images inside links in IE 10.
+ */
+
+img {
+  border-style: none;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change the font styles in all browsers.
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  font-family: inherit; /* 1 */
+  font-size: 100%; /* 1 */
+  line-height: 1.15; /* 1 */
+  margin: 0; /* 2 */
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+  overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+  text-transform: none;
+}
+
+/**
+ * Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button;
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+/**
+ * Correct the padding in Firefox.
+ */
+
+fieldset {
+  padding: 0.35em 0.75em 0.625em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+  box-sizing: border-box; /* 1 */
+  color: inherit; /* 2 */
+  display: table; /* 1 */
+  max-width: 100%; /* 1 */
+  padding: 0; /* 3 */
+  white-space: normal; /* 1 */
+}
+
+/**
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+  vertical-align: baseline;
+}
+
+/**
+ * Remove the default vertical scrollbar in IE 10+.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10.
+ * 2. Remove the padding in IE 10.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding in Chrome and Safari on macOS.
+ */
+
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button; /* 1 */
+  font: inherit; /* 2 */
+}
+
+/* Interactive
+   ========================================================================== */
+
+/*
+ * Add the correct display in Edge, IE 10+, and Firefox.
+ */
+
+details {
+  display: block;
+}
+
+/*
+ * Add the correct display in all browsers.
+ */
+
+summary {
+  display: list-item;
+}
+
+/* Misc
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 10+.
+ */
+
+template {
+  display: none;
+}
+
+/**
+ * Add the correct display in IE 10.
+ */
+
+[hidden] {
+  display: none;
+}
diff --git a/docs/assets/css/style.scss b/docs/assets/css/style.scss
deleted file mode 100644
index fdd12eda4..000000000
--- a/docs/assets/css/style.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-// stylelint-disable-next-line
-@import "{{ site.theme }}";
-
-.page-header .project-name a {
-	color: #fff;
-
-	&:hover {
-		text-decoration: none;
-		opacity: .7;
-	}
-}