Update PR template

Add HTML comments so that those lines don’t need to be removed manually

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,17 @@
 ## Describe the PR
+
 A clear and concise description of the bug the PR fixes or the feature the PR introduces.
 
 ## Related issues
-PR relates to issues in the `kirby` or `idea` repo:
+
+<!-- PR relates to issues in the `kirby` or `idea` repo: -->
+
 - Fixes #
 
 ## Ready?
-If you feel like you can help to check off the following tasks, that'd be great. If not, don't worry - we will take care of it.
+
+<!-- If you feel like you can help to check off the following tasks, that'd be great. If not, don't worry - we will take care of it. -->
+
 - [ ] Added unit tests for fixed bug/feature
 - [ ] Passing all unit tests
 - [ ] Fixed code style issues with CS fixer and `composer fix`