feat: add comprehensive FAQ page with categorized sections

[ArshiBansal]

Description

Added a comprehensive FAQ page (/faq) for DevPath.

closes #602

Key Features:

• Categorized FAQ sections (About DevPath, Pathway & Progression, Rewards & Points, Events & Opportunities, Resources & Learning, Community & Open Source)
• Modern dark theme consistent with the DevPath design system
• Smooth accordion-style expandable questions
• Uses existing MagneticText component and siteConfig
• Responsive design with hover effects and proper accessibility

This improves user experience by providing clear answers to common questions about pathways, rewards, events, open source contributions, and more.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Local testing
• Vercel Preview Deployment

Tested on:

• Desktop & Mobile viewports
• Dark mode
• Accordion open/close behavior
• Navigation link from Footer

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if needed)
• My changes generate no new warnings or errors
• I have checked that the "DevPath India" branding remains intact