[Draft] Adding docs

[dwreeves]

No description provided.

[dwreeves]

This PR combines both some necessary code changes as well as very preliminary docs.

I need to get 1.8 in by the time Astronomer Cosmos releases 1.4, as I am writing a blog post that will do some very minor cross promotion of Rich-Click (basically, I encourage users to alias their dbt command to .venv_dbt/bin/rich-click dbt). And without 1.8's performance improvements, I don't feel comfortable suggesting to users to do that, since the dbt command already has massive overhead and I want to add to that as little as possible.

I'm a busy guy though, so this may mean foregoing some of the docs stuff. I hope not but we'll see.

[dwreeves]

Bad PR hygiene (should have been a separate PR), but the behaviors for patching in the rich-click CLI are cemented, properly unit-tested, etc. 😄

No idea what's going on with the click 7.x tests though.

[dwreeves]

I need to get 1.8 in by the time Astronomer Cosmos releases 1.4

I don't think this is happening (I'm just way too busy right now), but it's fine.

[dwreeves]

This goes hard.

Just need to fix up a few things, and add the auto-code gen part.

[dwreeves]

Sooooooooooooooooooo close. So so so so very close.