style: added scrollbar to homepage

[kartik3110]

Related Issue

Closes: #869

Description of Changes

-added a custom themed scrollbar to the app.
-added styles for the scrollbar in globals.css.

Checklist:

• My code adheres to the established style guidelines of this project.
• I have conducted a self-review of my code.
• I have included comments in areas that may be difficult to understand.
• I have made corresponding updates to the project documentation.
• My changes have not introduced any new warnings.

Screenshots

Original	Updated

[vercel]

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[github-actions]

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[Sanchitbajaj02]

LGTM