Check deployment requirements

Some remarks about deployment:

The hpk-kubelet binary is missing when you clone the repo from github.
Potential solutions:
1) compile from source (requires golang)
2) download the precompiled version (currently done manually)
3) run it in container (not yet supported)

Cgroup v2:
The cgroupv2 must be enabled on the host.

https://kubernetes.io/docs/concepts/architecture/cgroups/
https://rootlesscontaine.rs/getting-started/common/cgroup2/
https://medium.com/nttlabs/cgroup-v2-596d035be4d7
https://github.com/opencontainers/runc/blob/main/docs/cgroup-v2.md