Sagar- New Frontend Updates

[sagars2004]

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

• new updated frontend UI for homepage and general web app
• curated sections and links for important features
• new user toggle for dark mode and proper handling
• updated header and footer
• fixes for some class structure and new user event handler for proper display adjustment

• Bug fix (non-breaking change which fixes an issue)
• [ X ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ X ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

Checklist:

• [ X ] My code follows the style guidelines of this project
• [ X ] I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• [ X ] My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (if a larger change)
• New and existing unit tests pass locally with my changes

[RafaelCenzano]

LGTM