Enhance documentation with comprehensive README and Mermaid diagrams

[brunojppb]

Summary

• Complete rewrite of README.md with comprehensive project documentation
• Added professional project description emphasizing security benefits
• Created detailed Mermaid diagrams showing system architecture and workflows
• Enhanced user experience with clear quick start guides and usage examples

Documentation Improvements

• Security-focused narrative: Clear explanation of PDF threats and why complete regeneration is superior
• Architecture overview: Detailed component descriptions and security approach
• Visual workflows: Mermaid sequence and flowchart diagrams showing request/response flows
• API documentation: Complete callback system documentation with request/response formats
• Development guide: Testing, configuration, and Docker deployment instructions

Mermaid Diagrams Added

• Request Flow Sequence Diagram: Shows complete client → server → worker → callback flow
• Background Worker Processing: Flowchart detailing PDF processing pipeline and error handling
• Process isolation and callback system visualization

Key Features

• Professional presentation with consistent emoji usage for navigation
• Accurate technical details reflecting actual implementation
• Clear code examples for both CLI and web server usage
• Comprehensive troubleshooting and development information

The documentation now tells a complete story about Sanitisium as a professional security tool, making it accessible for integration and contribution.

🤖 Generated with Claude Code