Implemented the landing page for the application and Removed the UI overflow

[a-m-a-nkumar]

I have Implemented the landing page for the issue number #124. Please review.

I have also resolved issue #129 and eliminated the UI overflow on nearly all pages. Previously, there was UI overflow in landscape view for every popup and on many pages.

I have removed the overflow and made the UI more responsive.

https://github.com/VaibhavCodeClub/learn/assets/99753046/30ed6d05-c48e-4309-84b9-06c5fb855608

[a-m-a-nkumar]

@sapatevaibhav Please review the changes and let me know if you would like to make any adjustments.

[sapatevaibhav]

Fix conflicts and mention me I'll merge it ASAP. @a-m-a-nkumar

[a-m-a-nkumar]

@sapatevaibhav I have fixed the conflicts.

[a-m-a-nkumar]

@sapatevaibhav Please assign the Level tag and GSSOC tag to the pull request and related issue.