Volumes are horrible, how would I easily edit a config file of the programm running inside, if the container deosnt even start.

Bind mounts + ZFS datasets are the way to go.

Kwrite doesnt really exist on its own anymore. Its a slimmed down gui for kate now.

It should work as long as it can reach the internet

You can’t expose ports on mobile data. You can ether host the web server at home or on a vps or use something like tailscale.