feat(mkdocs): Add theme palette configuration

Add automatic, light and dark mode toggle to the palette settings.

Fixes netbox-community#23

Author: pheus

{{cookiecutter.hyphenated}}/mkdocs.yml

@@ -12,9 +12,23 @@ theme:
   language: en
   #logo: assets/logo.png
   palette:
-    scheme: preference
-    primary: indigo
-    accent: indigo
+    # Palette toggle for automatic mode
+    - media: "(prefers-color-scheme)"
+      toggle:
+        icon: material/brightness-auto
+        name: Switch to light mode
+    # Palette toggle for light mode
+    - media: "(prefers-color-scheme: light)"
+      scheme: default
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+    # Palette toggle for dark mode
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to system preference
   features:
     - navigation.indexes
     - navigation.instant