Updated license file for the frontend
After I added the legal notice file for the CV, I wondered about the license file that we have linked in the frontend. It is liked for example on this page: https://sensors.gfz-potsdam.de/info/legal-notice/gfz/
I guess it was needed from one of the legal departments to have this list.
As we still have the script to generate the file, I updated the content.