Environment clean up procedure

[szpak]

initEnvironment makes some changes in a cluster. Sometimes, for different reason you might want to stop using kuberig on a given cluster. While for PoC it is just fine to delete the whole cluster, for shared clusters it might not be so easy.

There could be some list what happens on the env initialization (e.g. a service account is created) and maybe an instruction how to remove those changes (even using kubectl command).