Add smooth scrolling functionality

Walkthrough

The pull request includes significant modifications to the index.html and script.js files. The index.html file has been restructured for improved formatting, including the addition of self-closing tags, a new stylesheet for smooth scrolling, and an organized layout for various sections. The script.js file introduces a new function, smoothScrolling, which implements a smooth scrolling effect using the Lenis library. These changes enhance the overall structure and functionality of the web application.

Changes

File	Change Summary
index.html	Updated `<head>` with self-closing tags and new stylesheet link; restructured navigation, hero, upload, classification, disposal, FAQ, feedback, about, and footer sections for better readability and accessibility.
script.js	Added `smoothScrolling` function to implement smooth scrolling using the Lenis library; no other significant changes.

Assessment against linked issues

Objective	Addressed	Explanation
Implement smooth scrolling effect (#314)	✅

🐰 In the garden, we hop and play,
With smooth scrolling, we glide away!
From section to section, oh what a sight,
Our HTML shines, all polished and bright!
With every click, the joy we share,
A fluffy celebration, beyond compare! 🌼

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GarimaSingh0109 / WasteManagment