docs: autoselect initial color-scheme

Author: ukkopahis

mkdocs.yml

@@ -13,10 +13,12 @@ theme:
   favicon: stack-24.svg
   palette:
     - scheme: default
+      media: "(prefers-color-scheme: light)"
       toggle:
         icon: material/weather-sunny
         name: Switch to dark mode
     - scheme: slate
+      media: "(prefers-color-scheme: dark)"
       toggle:
         icon: material/weather-night
         name: Switch to light mode