Enable support for automatic light / dark mode.

Author: paveloom

mkdocs.yml

@@ -13,18 +13,22 @@ theme:
   icon:
     repo: fontawesome/brands/git-alt
   palette:
+    - media: "(prefers-color-scheme)"
+      toggle:
+        icon: material/brightness-auto
+        name: Switch to light mode
     - scheme: default
       media: "(prefers-color-scheme: light)"
       toggle:
-        icon: material/lightbulb
-        name: Switch to the dark theme
+        icon: material/brightness-7
+        name: Switch to dark mode
     - scheme: slate
       media: "(prefers-color-scheme: dark)"
       primary: deep purple
       accent: purple
       toggle:
-        icon: material/lightbulb-outline
-        name: Switch to the light theme
+        icon: material/brightness-4
+        name: Switch to system preference
   features:
     - content.code.copy
     - navigation.instant