feat: enhance Browser Use documentation with comprehensive improvements

- Added detailed overview and key capabilities section
- Expanded configuration settings with best practices and tradeoffs
- Added comprehensive troubleshooting section with common issues and solutions
- Included practical examples for various use cases (testing, responsive design, E2E)
- Added security considerations for data privacy and network security
- Created extensive FAQ section covering general, technical, and troubleshooting questions
- Added advanced topics section for dynamic content and authentication handling
- Improved formatting and organization throughout the document
- Added helpful tips and warnings for better user guidance

Author: roomote