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.

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.4.6/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.4.15/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",
@@ -8,13 +8,21 @@
   },
   "files": {
     "ignoreUnknown": true,
-    "includes": ["**/assets/**/*.js", "!**/*.min.js", "!**/assets/libs/**/*.js"]
+    "includes": ["**/assets/**/*.js", "**/assets/**/*.css", "!**/*.min.js", "!**/assets/libs/*.js"]
   },
   "formatter": {
     "enabled": true,
-    "indentStyle": "space"
+    "indentStyle": "space",
+    "lineWidth": 100
+  },
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
   },
-  "assist": { "actions": { "source": { "organizeImports": "on" } } },
   "linter": {
     "enabled": true,
     "rules": {
@@ -24,15 +32,21 @@
         "useArrowFunction": "off"
       },
       "style": {
+        "noDescendingSpecificity": "off",
         "useTemplate": "off"
       }
     }
   },
+  "css": {
+    "formatter": {
+      "quoteStyle": "single"
+    }
+  },
   "javascript": {
     "formatter": {
       "quoteStyle": "single",
-      "lineWidth": 100
+      "semicolons": "always"
     },
-    "globals": ["define", "htmx", "jQuery", "Alpine"]
+    "globals": ["Alpine", "htmx"]
   }
 }