Error 500 - favicon

Upon fixing the db container, the gemet app fails with

```
gemet.app | Internal Server Error: /favicon.ico
gemet.app | 172.20.0.1 - - [13/Apr/2022:20:40:40 +0000] "GET /favicon.ico HTTP/1.1" 500 336 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36"
```

when trying to access it via webbrowser


