Ingress-nginx is now deprecated, so we changed ingress management:
- traefik is now the default ingress class to use
- we add traefik ingressroute management too
We were using netcat to port to check if a service is up, but actually
we can do like Docker / Podman compose and check the status. For now,
I'm using the endpoint status, but maybe we can just check if the object
is "up".
- remove trailing spaces
- add instruction for packages
- reindent YAML examples
- remove section telling that there is no config files, as
`katenary.yaml` file can now be used
