Using color-scheme and light-dark() to implement dark mode (#154)

* Lint fixes.

* Implement light-dark().

* Lint css with biome, remove stylelint.

* Biome lint fixes.

* Dark mode adjustments.

* Style bug fixes.

* Colour adjustments.

* Move header and footer styles to base.

* Site header adjustments.

* Removing jQuery and umbrella libs. They where great but not needed anymore.

* Add colorScheme to optionally lock light/dark.

* Update README.

* Biome adjustments.

layouts/_partials/head/scripts.html

@@ -12,16 +12,6 @@
 <script defer src="{{ $alpine.RelPermalink }}"></script>
 {{ end -}}
 
-{{ if $.Param "jquery" -}}
-{{ $jquery := resources.Get "libs/jquery.slim.min.js" | fingerprint -}}
-<script defer src="{{ $jquery.RelPermalink }}"></script>
-{{ end -}}
-
-{{ if $.Param "umbrella" -}}
-{{ $umbrella := resources.Get "libs/umbrella.min.js" | fingerprint -}}
-<script defer src="{{ $umbrella.RelPermalink }}"></script>
-{{ end -}}
-
 {{ if $.Param "mobilemenu" -}}
 {{ $mobilemenu := resources.Get "js/mobilemenu.js" | js.Build $opts | fingerprint -}}
 <script defer src="{{ $mobilemenu.RelPermalink }}"></script>