add dark model, set color

mkdocs.yml

@@ -2,6 +2,27 @@ site_name: Prmbr Docs
 site_url: https://prmbr.com
 theme:
   name: material
+  palette:
+    # 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 
+      primary: brown
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+    # Palette toggle for dark mode
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      primary: black
+      toggle:
+        icon: material/brightness-4
+        name: Switch to system preference
+    #accent: orange
 
 extra:
   analytics: