Fix/test issue

[Huerte]

Type

• Bug fix
• New feature
• Documentation
• Refactor / internal

Overview

This PR updates the repository templates to follow open-source community standards. It removes intimidating instructions and replaces them with clear questions and copy-paste examples to lower the barrier for first-time contributors. Also remove the existing test for non-existing file.

Changes

• PULL_REQUEST_TEMPLATE: replaced rigid formatting rules with simple questions and added hidden HTML comments for guidance.
• PULL_REQUEST_TEMPLATE: marked the testing steps and checklist items as optional for documentation-only changes.
• ISSUE_TEMPLATES: added hidden notes reassuring contributors that they do not need to delete HTML comments.
• test_clean.py: removed this test suite because the file it was testing has been emptied.

Checklist

• I tested my changes locally and they work
• I updated CHANGELOG.md under the [Unreleased] section
• I updated README.md (if I added or changed a command)
• I added or updated tests for my change (if applicable)
• My change does not break any existing commands (if it does, describe the impact in the Overview