Remove unnecessary files

.gitlab/merge_requests_template/general.md

-# Merge Request: title
-
-## Summary
-
-## Todo
-- [ ]
-
-## Additional Resources
-
-- screenshots
-- websites
-- papers/books
-
-## Checklist
-
-- [ ] I do not commit `*.nc` or `*.zarr/**` directly to `git` but use `git lfs`
-- [ ] I only commit figures if they are really needed (figures increase repository size considerably)
-- [ ] Added changes to CHANGELOG.md