Auto-generate rocket docs

[SarahBornais]

Summary

Auto-generate rocket docs to centralize documentation maintenance.

Requirements

Research some good python documentation tools (this looks like a good place to start) and migrate documentation from the Rocket documentation website and /rocket help to docstrings in the code. Update the existing documentation resources to use the auto-generated docs.

Context

Brought up in October 17th meeting - maintaining docs in multiple places is difficult and leads to inconsistencies.

[bobheadxi]

for reference, Inertia has generated docs for its CLI published on a website, so some equivalent tooling for argparse likely exists out there if we go that route: https://inertia.ubclaunchpad.com/cli/

https://github.com/ubclaunchpad/inertia/blob/master/contrib/inertia-docgen/main.go