Update and Modernise README.md

The current README.md contains detailed information about features and structure, but it’s overwhelming and lacks clear usage instructions for quick on-boarding. A streamlined, modernised README would make the project far more accessible.

Suggested Improvements
- Screenshots & GIFs
- Show the configuration in action (before/after comparison).
- Add a quick GIF for workflows (e.g., fuzzy finding, LSP integration, file explorer toggle).
- Demo Video
- A short video walking through setup and everyday usage (compile & run, navigation, etc.).
- Modern README Components
- Badges (Neovim version, License, Stars).
- Clear, minimal installation & usage instructions at the top.
- Collapsible sections for advanced configuration.
- Concise, bulleted feature overview.
- Visual Enhancements
- Simple diagrams/graphs showing modular config structure or plugin architecture.
- Flowchart of how startup works with lazy.nvim.
- Support & Community
- Add “Support this project” section (e.g., Buy Me a Coffee / GitHub Sponsors).
- Clear contributing guidelines link.

This update will make the README:
- Readable for newcomers in 1–2 minutes.
- Actionable with quick copy-paste install steps.
- Engaging with visuals that demonstrate value.

⚡ By doing this, the README will reflect the polish of the configuration itself and help attract more users & contributors.