Add docs about creating lock files on initial set up

The problem

On initial set up, the requirements and other lock files are missing.

Definition of "done"

• Add documentation telling users the commands to run to generate these lock files on initial set up OR automatically run the commands on initial set up.
  • I would lean towards the former as running commands for users is always a bit dangerous and the error message when things go wrong are super cryptic
• Add documentation explaining that you need to make your virtual environment when you first set up, so that pre-commit can run

Additional context