Distinct favicon for each web application

Now that we have a couple of web applications running it might be nice, if we have a distinct favicon for each of the applications, so it is easier to navigate through open browser tabs. My idea is to combine the OSEG logo with a tiny logo of the application software to make it distinct.

• Create favicons and put them into a repository: https://gitlab.opensourceecology.de/server/favicons
• Install the favicons in the different web services
  • Blog: Uploaded and set via customizer
  • Website: green
  • Cloud: blue, set via web interface, Error: Exception: Argument 2 passed to OCA\Theming\ImageManager::setCachedImage() must be of the type string, null given, called in /container/www/apps/theming/lib/Controller/IconController.php on line 167
  • GitLab: red, set via web interface
  • Wiki: grey, set via favicon.ico
  • Hedgedoc: black, favicon.ico mounted inside container
  • Etherpad: teal
  • Survey: yellow, favicon.ico mounted inside container (/container/www/upload/themes/survey/erweitert_fruity/files)
  • Forum: violet, favicon.ico mounted inside container