MAINT: Moved issue templates to group.

.gitlab/merge_request_templates/Default.md

-# Summary
-
-    Insert a meaningful description for this merge request here.  What is the
-    new/changed behavior? Which bug has been fixed? Are there related Issues?
-
-# Focus
-
-    Point the reviewer to the core of the code change. Where should they start
-    reading? What should they focus on (e.g. security, performance,
-    maintainability, user-friendliness, compliance with the specs, finding more
-    corner cases, concrete questions)?
-
-# Test Environment
-
-    How to set up a test environment for manual testing?
-
-# Check List for the Author
-
-Please, prepare your MR for a review. Be sure to write a summary and a
-focus and create gitlab comments for the reviewer. They should guide the
-reviewer through the changes, explain your changes and also point out open
-questions. For further good practices have a look at [our review
-guidelines](https://gitlab.com/caosdb/caosdb/-/blob/dev/REVIEW_GUIDELINES.md)
-
-- [ ] All automated tests pass
-- [ ] Reference related Issues
-- [ ] Up-to-date CHANGELOG.md
-- [ ] Annotations in code (Gitlab comments)
-  - Intent of new code
-  - Problems with old code
-  - Why this implementation?
-
-
-# Check List for the Reviewer
-
-
-- [ ] I understand the intent of this MR
-- [ ] All automated tests pass
-- [ ] Up-to-date CHANGELOG.md
-- [ ] The test environment setup works and the intended behavior is
-  reproducible in the test environment
-- [ ] In-code documentation and comments are up-to-date.
-- [ ] Check: Are there spezifications? Are they satisfied?
-
-For further good practices have a look at [our review guidelines](https://gitlab.com/caosdb/caosdb/-/blob/dev/REVIEW_GUIDELINES.md).
-
-
-/assign me
-/target_branch dev