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/342b42aa10cf5076ca9173d1ad6a984b7d3694c2/docs/bootstrap
You should set ROOT_URL correctly, otherwise the web may not work correctly.