Add features section to landing page

[vaibhavy06]

Related Issue

Closes: #255

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Description

This PR enhances the landing page by adding a dedicated Features section to better showcase the functionalities and benefits of Manthan.

Changes Made

• Added Features section to the landing page
• Added feature cards highlighting platform capabilities
• Improved landing page structure and readability
• Added responsive UI elements for better user experience

Features Highlighted

• Create Tests
• Manage Classrooms
• Real-Time Results
• Secure Authentication
• Student Analytics

Benefits

• Better user engagement
• More informative landing page
• Improved overall UI/UX

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Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

[vaibhavy06]

Hi maintainers 👋

I have worked on issue #255 by adding a Features section to the landing page to better showcase the platform capabilities and improve the overall user experience.

Would appreciate any feedback or suggestions for improvement. Thanks!