feat: enhance UI with logo support and improved design ...

- Updated globals.css with enhanced animations and glassmorphism
- Added Footer component with subtle gradient and links
- Enhanced Hero with logo display (fallback to text if missing)
- Improved About section with icons and better typography
- Enhanced Contact with larger CTA button and hover effects
- Added placeholder logo file (geekbrain-io.png)
- Improved scroll reveal animations with cubic-bezier timing
- Added bonce-slow animation for scroll indicator

Interface now looks much more polished and professional.

Co-Authored-By: Claude Opus 4.6 <[email protected]>