Improve the Contributing section around testing your changes

[kjaymiller]

We mention doing things like running pre-commit but we don't really provide the best instructions on how to test (or run precommit) on our code.

If you are using a codespace this is done automatically but not if you are developing locally.

Another option is to have pre-commit add the changes post-commit

How to fix

We can provide screenshots and instructions on how to test and lint your code prior to pushing your changes.

[dragid10]

I can take this!