Clean up: Remove old carousel component and screenshot images

- Remove Carousel.svelte component (replaced by VideoPlayer)
- Remove 5 screenshot images no longer needed for carousel
- Keep only necessary assets for the new video-based hero section

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: sathvik-palley