feat: added new About page UI with dark mode and updated route

[Sudeepthi-Mounika]

Description

Brief description of what this PR accomplishes.

Fixes #322

Type of Change

• [ ✅] Bug fix
• [ ✅] New feature

Testing

• [ ✅] Manual testing
• [ ✅] Tested on multiple browsers/devices

Screenshots

Checklist

• [ ✅] Code follows project style guidelines
• [ ✅] Self-reviewed my code
• [✅ ] No new warnings or errors
• [ ✅] Tested changes locally

Hacktoberfest

• [ ✅] This is a meaningful contribution (not spam/low-effort)
• [ ✅] I have read the contribution guidelines

[vercel]

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