chore: simplify the PR template

Author: rokroskar

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,3 @@
-**IMPORTANT: Please do not create a Pull Request without creating an issue first.**
-
 # Description
 
 Please include a summary of the change and which issue is fixed.
@@ -10,23 +8,6 @@ Fixes # (issue)
 
 ## Type of change
 
-Please select relevant options.
-
-- [ ] Bug fix (non-breaking change which fixes an issue)
-- [ ] New feature (non-breaking change which adds functionality)
-- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
-- [ ] This change requires a documentation update
-
-## Checklist
-
-**Do not create pull request unless you checked all points.**
-
-- [ ] I have read and understood the **CONTRIBUTING** document.
-- [ ] I have performed a self-review of my own code.
-- [ ] I have signed and sent the [CLA document]
-      (https://github.com/SwissDataScienceCenter/documentation/wiki/files/SDSC_Contributor_License_Agreement_v1.0.pdf).
-- [ ] I have added tests to cover my changes.
-- [ ] I have **NOT** removed any existing tests.
-- [ ] I have updated the documentation accordingly.
-- [ ] I have described *all* changes in the **CHANGELOG.rst**.
-- [ ] I have run ``./run-tests.sh`` locally.
+This repository uses [conventional-commits](https://www.conventionalcommits.org/en/v1.0.0/). 
+Please use this convention also for the title of your PR, e.g. using `feat:`, `fix:`, `docs:`, 
+`build:` for feature, bug-fix, documentation and CI PRs respectively.