Remove unused css and html from index file + Modularize code

[mehul-m-prajapati]

🛠️ Fixes Issue

Fixes: #603

👨‍💻 Description

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• Bug fix (non-breaking change which fixes an issue)
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[aslams2020]

This PR has been merged by the GSSoC team
here - sanjay-kv/Open-source-Practice#1463

Don't add labels to it now.

You'll get the points in the leaderboard update.