Fix logo and favicon

mkdocs.yml

@@ -5,7 +5,10 @@ repo_name: mailcow/mailcow-dockerized
 repo_url: https://github.com/mailcow/mailcow-dockerized
 edit_uri: ../mailcow-dockerized-docs/edit/master/docs/
 remote_branch: gh-pages
-theme: material
+theme:
+  name: material
+  logo: images/logo.svg
+  favicon: images/favicon.png
 markdown_extensions:
   - codehilite:
       guess_lang: true
@@ -128,8 +131,6 @@ nav:
     - 'Portainer': 'third_party-portainer.md'
     - 'Roundcube': 'third_party-roundcube.md'
     - 'SOGo Connector for Thunderbird': 'third_party-thunderbird.md'
-icon:
-  logo: "images/logo.svg"
 extra:
   palette:
     primary: "indigo"