Update URL in header template / all header files
We should change the URL in all files and the template in CONTRIBUTING.md to "https://www.mw.tum.de/am"
29. April 2024: Due to updates GitLab may be unavailable for some minutes between 10:00 and 12:00.
We should change the URL in all files and the template in CONTRIBUTING.md to "https://www.mw.tum.de/am"