Rename Sponsors section to Planetary Partners

[garbas]

Summary

• Rename "Sponsors" to "Planetary Partners" across the website
• Update anchor ID from #sponsors to #planetary-partners
• Update navigation links in index.html, agenda.html, and speakers.html

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[github-actions]

🔍 Lighthouse Performance Report

Performance audit completed for commit 055d025

Scores Comparison

Category	Base (main)	This PR	Change
⚡ Performance	59/100	91/100	🟢 +32
♿ Accessibility	100/100	100/100	⚪ 0
✅ Best Practices	100/100	100/100	⚪ 0
🔍 SEO	100/100	100/100	⚪ 0

Performance Impact

🎉 Great job! Performance improved by 32 points!

✨ Performance score is excellent!

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📊 Score Guide

• 🟢 90-100: Good
• 🟠 50-89: Needs improvement
• 🔴 0-49: Poor

Change indicators:

• 🟢 Positive change (improvement)
• 🔴 Negative change (regression)
• ⚪ No change

🚀 Current Optimizations

Optimizations in place:

• ✅ Image optimization (76.6% size reduction)
• ✅ Lazy loading for below-fold images
• ✅ Optimized fonts with font-display: swap
• ✅ Minified CSS and assets

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🤖 Automated report generated by Lighthouse CI comparing against main branch