Repository thinning

Our The repository is becoming bigger and bigger due to the test trajectories and I expect an even quicker increase due to more physical regression we have to and will add. Therefore, we must consider moving the trajectory data to a different location using Git Large File Storage (LFS) (or something else?) which is supported by GitLab. to keep the performance.

According to this reference we can afterwards clean up our history

git filter-branch --index-filter "git rm -rf --cached --ignore-unmatch FILE" HEAD