Merge pull request 'Add dark and light theme mode to docs, detection, and button' (#360) from r3g_5z/akkoma:docs-dark-mode into develop

Reviewed-on: AkkomaGang/akkoma#360

docs/mkdocs.yml

@@ -12,8 +12,21 @@ theme:
     - navigation.instant
     - navigation.sections
   palette:
-    primary: 'deep purple'
+    - media: "(prefers-color-scheme: light)"
-    accent: 'blue grey'
+      scheme: default
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+      primary: 'deep purple'
+      accent: 'blue grey'
+
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+      primary: 'deep purple'
+      accent: 'blue grey'
 
 extra_css:
   - css/extra.css