ci: Update mkdocs.yml

Author: teolemon

mkdocs.yml

@@ -13,3 +13,16 @@ theme:
   name: material
   features:
     - content.action.edit
+  logo: https://static.openfoodfacts.org/images/logos/off-logo-horizontal-light.svg
+  favicon: https://static.openfoodfacts.org/images/logos/off-logo-favicon-light.png
+  palette: 
+    # Palette toggle for light mode
+    - scheme: default
+      toggle:
+        icon: material/brightness-7 
+        name: Switch to dark mode
+    # Palette toggle for dark mode
+    - scheme: slate
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode