Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/blame/commit/ea251215e8742e704c94c5cc8c63f238f9c3dba9/doc/images/LCD_characters_green/full_bar_l0.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.