[MAINT] implement dark mode

mkdocs.yml

@@ -9,9 +9,27 @@ theme:
   language: "en"
   favicon: img/favicon.png
   logo: img/favicon_on_white.png
+  icon:
+    repo: fontawesome/brands/github
+    edit: material/pencil
   palette:
-    primary: "dark blue"
-    accent: "light blue"
+    # 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
 
 # Pages
 nav: