Change: Use an updated PR template

The old template was not well understood and ofter not all sections and
checks have been filled. Therefore simplify and reformat the PR
template.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,32 +1,18 @@
-**What**:
+## What
 
 <!--
   Describe what changes are being made, e.g. which feature/bug is being
-  developed/fixed in this PR?
+  developed/fixed in this PR? How did you verify the changes in this PR?
 -->
 
-**Why**:
+## Why
 
-<!-- Why are these changes necessary? -->
+<!-- Describe why are these changes necessary? -->
 
-**How**:
+## Checklist
 
-<!--
-  How did you verify the changes in this PR?
-  If this PR contains tests this section can be considered done.
-  Otherwise please write down the steps on how you did test your changes and
-  verified that the changes are working as expected.
-
-  See https://www.ministryoftesting.com/dojo/lessons/community-stories-to-shift-left-start-right
-  for some background.
- -->
-
-**Checklist**:
+<!-- Remove this section if not applicable to your changes -->
 
-<!-- add "N/A" to the end of each line not applicable to your changes -->
+- [ ] Tests
 
-<!-- to check an item, place an "x" in the box like so: "- [x] Tests" -->
 
-- [ ] Tests
-- [ ] Conventional commit message
-- [ ] Documentation