Add GitHub repo icon to MkDocs theme

Configured the MkDocs theme to use the FontAwesome GitHub brand icon for the repo. This enhances the visual representation of the repository link in the documentation.

Author: FeodorFitsner

mkdocs.yml

@@ -19,6 +19,7 @@ theme:
   logo: 'images/logo.svg'
   icon:
     annotation: material/plus-circle
+    repo: fontawesome/brands/github
   palette:
     - scheme: default
       primary: pink