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/6f92abdc7e3c0a096c3d5f9f8cdb19f0ca1dbbf2/docs/font-awesome
You should set ROOT_URL correctly, otherwise the web may not work correctly.
Chip Audette