Completely revamped the install process

[Anarch157a]

I know it's a lot of stuff to take in one go, but this install process dispenses with scripts and uses only the docker-compose.yml to start the containers, while all the settings are done in a configuration file with environment variables.

The complete process is described on the README.md with as much detail as I could muster.

I tested the install with both Docker and Podman on a Debian 12 LXC container running under Proxmox, something that is pretty common on the Selfhosting community, for what I could gather from Reddit and Lemmy.

I hope you enjoy.