feat: Add Copy Button to Documentation Code Snippets (#1842)

[Arohi-jd]

This PR adds a “Copy” button to all code snippets in the documentation (index.html), allowing users to copy code examples and commands with a single click.
The feature improves usability and reduces the chance of errors when copying commands manually.
All changes are contained within index.html, with inline CSS and JavaScript — no external files were modified.
Key Changes
Added a <style> block in the to style the copy button (positioning, hover effects, and success state).
Added a <script> block before the closing tag that:
Detects all

 blocks on page load.

Injects a copy button dynamically.

Uses navigator.clipboard.writeText() to copy text.

Provides success feedback with a checkmark icon.

This are the changes shown in image