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/9c9ebe5aae185576d8b9f4c452407c0f1b1581a7/config
You should set ROOT_URL correctly, otherwise the web may not work correctly.