What are they? What are they for?
Repositories are GitHub's format for storing projects using Git. A GitHub repository should contain all the information for a specific project.
The repository limit on our plans represents how many repositories you can use across all of your combined Release Pages. For instance, the Basic plan is limited to 10 repositories. This means you will be able to create one Release Page that combines the release notes of 10 repositories, or two Release Pages that each are connected to 5 repositories, or any other combination you need.