docs: add notes about pull request and validating changes (#427)

.github/pull_request_template.md

@@ -1,14 +1,24 @@
-## Context & Description
+<!--
+👋 Thank you for your Pull Request 🙏
+-->
+
+### Checklist
+
+- [ ] I have read [Contributing > Pull requests](https://tuono.dev/documentation/contributing/pull-requests)
+
+### Related issue
+
+Fixes #0
+
+<!-- Replace the content with "None" if you haven't an issue to link -->
+
+### Overview
 
 <!--
-Thank you for your Pull Request.
 
 Explain the context and why you're making that change.
 What is the problem you're trying to solve?
 If a new feature is being added,
 describe the intended use case that feature fulfills.
 
-Bug fixes and new features should include tests.
-
-PR guide: https://tuono.dev/documentation/contributing/pull-requests
 -->