Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/432c4e33366caca3d53aee24712cf87efe09c3b6/doc/images/LCD_characters_green/n.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.