Enhance documentation with expanded guides and examples

[codegen-sh]

This PR significantly improves the documentation by adding new guides and enhancing existing content:

New Content

• Getting Started Guide: A comprehensive guide to help new users set up and start using Codegen effectively
• Troubleshooting Guide: Detailed solutions for common issues and error messages
• Expanded FAQ: Added several new questions and answers to address common user queries

Enhancements

• Enhanced Best Practices: Added concrete examples for each best practice in the capabilities.mdx file
• Added Limitations Section: New section in capabilities.mdx that outlines current limitations and known issues
• Improved Introduction: Updated with links to the new guides and help resources

These changes make the documentation more comprehensive, practical, and user-friendly, helping users get the most out of Codegen.

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