Enhance contribution guide, automation docs, and add documentation index

Co-authored-by: salmanmkc <32169182+salmanmkc@users.noreply.github.com>

docs/checks/README.md

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+# Troubleshooting Guides
+
+This directory contains troubleshooting guides for common issues you might encounter when setting up or running GitHub Actions self-hosted runners.
+
+## Quick Reference
+
+| Issue Type | Guide | Description |
+|------------|-------|-------------|
+| 🌐 **Network** | [network.md](network.md) | Connection issues, proxy, firewall problems |
+| 🔒 **SSL/TLS** | [sslcert.md](sslcert.md) | Certificate and TLS handshake issues |
+| 📦 **Git** | [git.md](git.md) | Git configuration and repository access |
+| ⚡ **Actions** | [actions.md](actions.md) | Action-specific runtime issues |
+| 🟢 **Node.js** | [nodejs.md](nodejs.md) | Node.js runtime and npm issues |
+| 🌍 **Internet** | [internet.md](internet.md) | General internet connectivity |
+
+## Common First Steps
+
+Before diving into specific guides, try these general troubleshooting steps:
+
+### 1. Check Basic Connectivity
+```bash
+# Test GitHub API access
+curl -I https://api.github.com/
+
+# For GitHub Enterprise Server
+curl -I https://your-github-enterprise.com/api/v3/
+```
+
+### 2. Verify Runner Status
+```bash
+# Check if runner service is running
+./svc.sh status
+
+# View recent logs
+tail -f _diag/Runner_*.log
+```
+
+### 3. Test Runner Configuration
+```bash
+# Re-run configuration
+./config.sh
+
+# Test connection without running
+./run.sh --check
+```
+
+## Getting Additional Help
+
+If these guides don't resolve your issue:
+
+1. **Search existing issues** in the [runner repository](https://github.com/actions/runner/issues)
+2. **Check GitHub Status** at [githubstatus.com](https://githubstatus.com)
+3. **Ask the community** in [GitHub Community Discussions](https://github.com/orgs/community/discussions/categories/actions)
+4. **Contact support** for critical issues via [GitHub Support](https://support.github.com/contact)
+
+## Contributing
+
+Found a solution to a common problem not covered here? Consider contributing:
+
+1. Create a new `.md` file for the issue type
+2. Follow the format of existing guides
+3. Submit a pull request with your improvements
+
+---
+
+💡 **Tip**: Always check the `_diag/` directory for detailed log files when troubleshooting issues.