Add Pull Request templates

Add code pr template and docs pr template for conformity.

.github/PULL_REQUEST_TEMPLATE/docs-pr-template.md

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+## 📚 Documentation Update
+
+<!-- Describe the purpose of this PR in one or two sentences. Example: "This PR updates the contributor guidelines by merging frontend and backend sections." -->
+
+---
+
+## 📝 What’s Changed?
+
+<!-- Briefly outline what parts of the documentation were added, changed, removed, or reorganized -->
+
+- Combined frontend and backend development guidelines into a single file
+- Updated `mkdocs.yml` to reflect new structure
+- Added clarification on contribution process
+- Fixed outdated links in sidebar
+
+---
+
+## 🔍 Related Issue(s)
+
+<!-- Link to related issues, discussions, or context (e.g., closes #123) -->
+
+---
+
+## ✅ Checklist
+
+- [ ] I followed the formatting/style of existing documentation
+- [ ] I updated `mkdocs.yml` if necessary
+- [ ] I verified links and references still work
+- [ ] I checked that my changes improve clarity, structure, or accuracy
+- [ ] I'm open to feedback and suggestions
+
+---
+
+## 🙋 Additional Notes
+
+<!-- Optional: Include anything you want reviewers to be aware of -->