Add Nix & Friends Happy Hour announcement banner

[garbas]

Summary

• Adds a yellow announcement banner at the top of all pages (index, speakers, agenda)
• Links to RSVP page at luma.com/gibr7uz9 for the social event after Planet Nix

[netlify]

✅ Deploy Preview for planetnix ready!

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[github-actions]

🔍 Lighthouse Performance Report

Performance audit completed for commit daa0a10

Scores Comparison

Category	Base (main)	This PR	Change
⚡ Performance	26/100	91/100	🟢 +65
♿ 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 65 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