[Docs] Improve Documentation Experience

[csxark]

Description

Improve the documentation UI.

Tasks

• Copy code button
• Better code blocks
• Previous/Next navigation
• Better TOC
• Search highlighting
• Better MDX styling

Expected Outcome

A modern documentation experience.

Difficulty: Good First Issue

[Aditya8369]

@csxark can you assign me please?

[csxark]

Hi! @Aditya8369, I'm assigning this initiative to you.

A warm welcome to the CryptoViz project! We're excited to have you on board and truly appreciate your willingness to contribute. Looking forward to your creativity and meaningful contributions, especially from the branding perspective. Wishing you the very best, and happy contributing! 🚀