Update contributor & testing guides

[jeff-mccoy]

No description provided.

[jeff-mccoy]

Ready for review, will include other docs changes in different PR

[jeff-mccoy]

Quick note on removing the date stamp from the cobra docs. Though I do think it is somewhat useful, I think the better answer is just versioning the docs as we discussed and the way the docs generating would cause every PR to potentially have fun merge conflicts if someone else got their PR merged first:

[jeff-mccoy]

Also note that the make docs-and-schema target uses go run main.go vs just calling the binary build as we want to ensure we have the latest/correct version of the docs/schema.