Remove the old template and update the PR one

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,19 @@
 I want to merge this change because...
 
-(Please mention all relevant issue numbers.)
+<!-- Please mention all relevant issue numbers. -->
 
-(If your changes affect the UI, providing "before" and "after" screenshots will
-greatly reduce the amount of work needed to review your work.)
+### Screenshots
+
+<!-- If your changes affect the UI, providing "before" and "after" screenshots will
+greatly reduce the amount of work needed to review your work. -->
 
 ### Pull Request Checklist
 
-(Please keep this section. It will make maintainer's life easier.)
+<!-- Please keep this section. It will make maintainer's life easier. -->
 
 1. [ ] Privileged views and APIs are guarded by proper permission checks.
 1. [ ] All visible strings are translated with proper context.
 1. [ ] All data-formatting is locale-aware (dates, numbers, and so on).
 1. [ ] Database queries are optimized and the number of queries is constant.
 1. [ ] The changes are tested.
 1. [ ] The code is documented (docstrings, project documentation).
-1. [ ] Python code quality checks pass: `pycodestyle`, `pydocstyle`, `pylint`.
-1. [ ] JavaScript code quality checks pass: `eslint`.