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/5592b95c7538f0451513aba7b5f6aa07962d9a3f/data/weather-settings.gif
You should set ROOT_URL correctly, otherwise the web may not work correctly.