docs: rewrite README with clearer structure and complete feature coverage

Reorganized README with:
- Reduced emoji usage for cleaner look
- Quick Setup section with progressive examples
- Advanced Usage section covering configuration, exports, replay, redaction
- Complete API reference tables
- Production safety guidance
- Troubleshooting section

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cmcWebCode40