Fix: Move main.js to body and remove duplicate chatbot.js script tag

[Mohit-001-hash]

Description

Fixed two bugs in index.html related to script loading:

1. main.js was in without defer/async — This caused
   render blocking where the browser stopped parsing HTML until
   the script finished loading, slowing down page load time.
   Fixed by moving main.js to the bottom of with other
   scripts.

2. chatbot.js was duplicated — The script was included twice
   which caused double initialization of the chatbot.
   Fixed by removing the duplicate script tag.

Type of Change

• Bug fix
• Performance improvement

Changes Made

File	Change
index.html	Moved main.js from head to bottom of body
index.html	Removed duplicate chatbot.js script tag

How to Test

1. Open index.html in browser
2. Open browser dev tools → Network tab
3. Verify main.js loads after page content
4. Verify chatbot.js appears only once in network requests

Checklist

• I have performed a self-review of my code
• My changes do not break any existing functionality
• I have commented my code in hard-to-understand areas
• I have tested changes locally

Additional Notes

All other scripts were already correctly placed at the bottom
of body. This fix makes main.js consistent with the rest.