Improve hero render prioritization and document lazy loading

[karunasree04]

Summary

Improves frontend performance guidance and hero rendering prioritization.

Changes

• Added performance comment for decorative hero visuals
• Explicitly prioritized hero content rendering using CSS order
• Added contributor guidance recommending loading="lazy" for future <img> tags

Why

This helps reinforce web performance best practices while preserving the current visual layout and user experience.

[vercel]

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