Suggest to protect branches on shared repo #212
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Previously the course said that on a shared repository everyone can push to the main branch, but people should be encouraged to raise pull requests.
GitHub you can enforce this action by protecting the main branch.
I think the course should be instruction the attendees to do this. Without branch protection, it is very easy to accidentally push to the main branch, which can disrupt other developers, miss out on the advantages CI and code review give you, and create confusion about whether that is ever the right approach.
This change alters the text to instruct attendees how to configure branch protection with sensible defaults, and suggests that they do that.
As the text is no longer suitable for a bullet point (and it was pretty long before!) I also put the content under a header. It might be easiest to review the changes commit by commit.