This has fallen into disuse since the big Java vulnerability, and I
have ideas for better ways of doing this. Meanwhile it's making
maintenance and refactoring more difficult.
Hence I'll remove the server completely for the time being.
If localhost is specified in the proxyPass url, nginx will happily
resolve IPv6 addresses, even if the upstream doesn't support them.
This can result in connection issues, especially with containers that
don't support IPv6.
This removes all existing services as well, in preparation of moving
them to `podman`. These are easier to update to
virtualisation.oci-containers while retaining the "networks" through
pods.