chore(pull_request_template): Update PR template

[doronkg]

What this PR does / why we need it

This PR slightly improves the PR template readability and comments out the CONTRIBUTING.md reference.

PR Checklist

• [x] This PR adds docs

Github Issue

[XX-XX]

Notes for your reviewers

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 40.84%. Comparing base (710239d) to head (c4a75de). Report is 1 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #282 +/- ## ======================================= Coverage 40.84% 40.84% ======================================= Files 58 58 Lines 2904 2904 ======================================= Hits 1186 1186 Misses 1530 1530 Partials 188 188 ```

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