Add dark mode to docs

Author: timvink

mkdocs.yml

@@ -20,6 +20,21 @@ theme:
         repo: fontawesome/brands/github
     features:
         - content.tabs.link
+    palette:
+        - media: "(prefers-color-scheme: light)"
+          scheme: default
+          toggle:
+              icon: material/toggle-switch-off-outline
+              name: Switch to dark mode
+          primary: blue
+          accent: blue
+        - media: "(prefers-color-scheme: dark)"
+          scheme: slate
+          toggle:
+              icon: material/toggle-switch
+              name: Switch to light mode
+          primary: blue
+          accent: blue
 
 plugins:
   - search