Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/OpenAudio_ArduinoLibrary/src/commit/d9efa3143ac925478c00e48262e57b74c1c8ae4b/docs/font-awesome/css
You should set ROOT_URL correctly, otherwise the web may not work correctly.
Chip Audette