[B-011] Doc restructuring and optimization

[ronstorm]

✅ Clean Structure:

• Main README: 152 lines (down from 706) - focused overview
• Docs/ folder: 8 dedicated concept files with detailed explanations
• Examples/ folder: 3 working examples with proper documentation

✅ Key Improvements:

• Progressive learning: Start with basic usage, dive deeper into concepts
• Easy navigation: Clear links between related topics
• Maintainable: Each concept in its own file
• Complete examples: All code examples are runnable
• Proper Dependencies: Shows how to extend TCAKit's dependency system

✅ What's Ready:

• All tests passing (51/51)
• No linting errors
• Complete documentation coverage
• Working examples with proper SwiftUI integration
• Clear setup instructions

The documentation now follows best practices and should provide a much better developer experience for anyone wanting to learn and use TCAKit! 🚀