Apply the heuristics for the NLnet projects hosted on github.com

### Context
Approximately 60% of the projects sponsored by NLnet are currently hosted on github.com GitHub also provides mature query mechanisms so it's likely to be a useful early iteration to provide insight and feedback on our proposed objective of assessing the testing and automated tests performed by the project teams for these projects.

### Further info
The wiki on this repo provides heuristics and some notes on querying GitHub using URL query parameters https://github.com/commercetest/nlnet/wiki

Start with the repository wiki linked in the issue, especially its heuristics and notes on GitHub URL query parameters. Then inspect the repository to determine the relevant analysis entry point; done means the heuristics have been applied to NLnet projects hosted on GitHub and the resulting insights are available for review.

Written by the indexing model from the issue text.