This does away with the giant dump from cobra for kubectl and instead
generates md files which contain similar information, but one per verb.
This might work well as part of the cobra project, instead of doing it
in kube, but this gets us nice, linked, documentation right now. If
people like it, I will try to get something similar into cobra.
generate man pages for kubectl using the cobra.Command information.
This will directly create files in (by default) docs/man/man1/ called
kubectl*.1. Each child verb/cobra command will gets its own man page.