Your ROOT_URL in app.ini is https://gitea.jennalody.de/ but you are visiting https://gitea.jenslody.de/jenna/gnome-shell-extension-openweather/src/commit/b8fb91e917971d51bbf727d43d1801e8d5b08652/data/weather-settings.gif
You should set ROOT_URL correctly, otherwise the web may not work correctly.