Create a `config` command

[mrsimonemms]

As part of the refactored installation process, a key part of the application will be the configuration generation.

To that end, there should be a new config root command which everything will stem from. This will be about manipulating a config file that is then submitted to the Installer for rendering into the generated YAML that can be deployed to the Kubernetes cluster.

As part of this, we should also deprecate the init command and replace with a new config init. This will generate the same config file as before, except that it will save it to the file