Added SWAG config patch script

[Root-Core]

This is a quick and dirty script, that patches the config of SWAG. Currently there are several issues, that aren't documented in the guide:

• Changing ports require config updates
• Some default ports differ from what SWAG expects
• If your setup relies on gluetun (full VPN setup), you need to rewire all requests to the gluetun container
• Also it automates enabling authelia, if desired

We just read the env from the file and copy the samples patched to actual conf files.

(set -a && source 'docker-compose.env' && set +a && python3 swag_config_patcher.py)

We may need some documentation in the guide for this, but it solved a lot of headaches for me.

EDIT: Only homarr, portainer, sabnzbd are not reachable now. (111: Connection refused) - Not sure what's the issue here.

EDIT2: portainer is not part of full-vpn_single-yaml and homarr should be fixed.

EDIT3: sabnzbd works if it's port is set to 8080, which is the default port. All other containers use their default ports. This is a bit odd, but I don't know the gluetun workflow. All other containers use their default ports by default.

EDIT4: The gluetun setup should not use configurable ports or set them in each container internally.. https://github.com/qdm12/gluetun-wiki/blob/main/setup/port-mapping.md