implemented hero section for landing page

[nikitatri]

✨ What's New:

• Redesigned the hero section to include an engaging headline, subheading, and two clear call-to-action buttons: "Start Coding" and "Browse Challenges".
• Integrated CSS animations for:
  • Title (fade and slide-up)
  • Subtitle (fade-in)
  • Buttons (zoom-in with hover scale)
• Ensured responsiveness across mobile, tablet, and desktop using Flexbox.
• Maintained existing animated background bars and adapted theme styling for visual consistency.
• Improved accessibility with semantic HTML and clean structure.

Related issue:

• Closes Implement hero section for landing page #3

📱 Mobile Ready:

• Button stack and font scaling for small screens
• Clean layout adjustments on tablet and below

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Let me know if you’d like to enhance the animations further or add interactive scroll effects. 🚀