Clean up old github project

[pahmann]

We used the classic project with cards and issues in the project two years back. One of the two boards was closed as the tasks were finished. The second project includes some cards which are not transferred to issues.
The project can be found here https://github.com/elisa-tech/wg-automotive/projects/1
Some cards may no longer be valid, so it may not be needed to transfer them one to one to the Issues list