Consider a cli reference section

[nwneisen]

We should consider adding a commands section where we can go into more details and give more example usage for each subcommand. This is common in many cli tools

https://docs.docker.com/reference/cli/docker/
https://docs.k0sproject.io/stable/cli/
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands
https://mirantiscontainers.github.io/blueprint/docs/bctl-reference/