Make docs for cli

[evshubbs]

[tstirrat15]

I did some research on this and we actually can get it relatively for free from cobra internals: https://pkg.go.dev/github.com/spf13/cobra/doc#GenMarkdownTree

The lift here would be:

1. Write a script that invokes the above, perhaps using mage
2. Write automation that runs that script and diffs it, likely on merge
3. Write automation that submits it to the docs repo when the diff changes

This would solve authzed/docs#260 as well.

[authzedbot]

Linked to Unthread ticket:

Permission Denied Error with CLI Connection to Cluster #576