Add step by step instructions for adding and removing branch protection rules

[teor2345]

I thought this would include actual details (and possibly screenshots) of where and how these can be changed in github. e.g from the repo go to Settings > Branches and click "Edit" on the main branch entry.

I was able to figure this out myself but I was a bit nervous clicking around unsure of what would happen...

Originally posted by @mpguerra in #7773 (comment)