Add pre-commit GitHub workflow, add "Getting started" docs

[angela-tran]

• Adds GitHub action for pre-commit
• Adds Python linting
• Closes Create home page for Eligibility API docs #9

Similiar to cal-itp/eligibility-server#14

[angela-tran]

@machikoyasuda This PR is ready for your review!

[machikoyasuda]

@angela-tran Could you add the basic repo set up command instructions? I think I can guess them, but I don't want to mess it up and want to set it up as you've intended!

[angela-tran]

@machikoyasuda Sure thing. Just to make sure I understand, do you mean instructions kind of like these: https://docs.calitp.org/eligibility-server/#getting-started-with-the-app?

[machikoyasuda]

@machikoyasuda Sure thing. Just to make sure I understand, do you mean instructions kind of like these: https://docs.calitp.org/eligibility-server/#getting-started-with-the-app?

yes! just the basic commands to clone, build and run the container

[angela-tran]

@machikoyasuda I added a home page and a "Getting started" page to the docs, which also means we can close #9 🎉 (if approved)

Here is the rendered output that I see locally for getting started:

You should be able to just open the devcontainer in VS Code without having to build anything beforehand.

[machikoyasuda]

Once @thekaveman's edits are added, I'm good with this PR!

I ran this locally with the instructions and tested adding a commit that doesn't pass pre-commit rules:

and it worked great.

[thekaveman]

Nice!