feat: add modern animated landing page for GitHub Pages

[fiozxr]

This PR adds a modern, highly animated landing page for PentestCode using only HTML, CSS, and JavaScript.

Included

• Modern cinematic landing page
• Responsive desktop and mobile layouts
• Animated agent architecture visualization
• Interactive cursor and magnetic UI interactions
• Scroll-driven motion and 3D perspective effects
• Animated terminal/engagement interface
• Engagement-state visualization
• Capability showcase
• Installation section with copy-to-clipboard
• Optional optimized background video support
• Reduced-motion accessibility support
• No frameworks or build process required

GitHub Pages

The website is structured to be served directly from the /docs directory.

Could you please configure GitHub Pages to deploy from:

main branch → /docs

This keeps the website alongside the repository while allowing it to be deployed automatically through GitHub Pages.

The /docs directory can also be extended later with additional documentation pages, guides, architecture details, or other project documentation as the project grows.

The design intentionally keeps the website framework-free so it should remain easy to maintain and extend.

Notes

The background video is optional and can be replaced with an optimized project-specific loop in:

/docs/assets/loop.mp4

The current implementation gracefully falls back to the static animated background if the video is not present.