Update README

[iThorgrim]

This pull request proposes a "comprehensive" update to the mod-eluna Readme. The goal is to improve readability, adopt a modern style, and provide clearer.

Key changes include:

• A more engaging introduction with badges for key resources.
• A structured layout with an interactive table of contents.
• Reorganized sections for easy access to essential information.
• Updated command examples and links to useful resources.

Main Changes

1. Visual Introduction:
   • Added badges, a tagline, and a centered layout for better first impressions.
2. Improved Structure:
   • Introduced an interactive table of contents.
   • Highlighted community and contribution sections.
3. Installation Instructions:
   • Added options for selecting the Lua version.
4. Documentation and Resources:
   • Linked to official documentation and APIs (link updated).
   • Grouped community contributions in a dedicated section.
5. Community Contributions:
   • New section showcasing recent additions in a clear and concise list (and linbk to a new files with all new features).