Enhance app.py UI with new logo and updated title; add demo assets to .gitattributes. Remove unused main function from navigation.py and streamline .gitignore.

Update image assets and refactor app.py for improved functionality. Added new images, removed outdated ones, and updated paths in IMAGE_PATHS. Renamed render_demo3 function to render_demonstrate for clarity. Adjusted UI styles and fixed image loading issues.

Add initial project structure with core files, configurations, and sample images

initial commit