Add accordion-style display for previous years' sponsored events

[kjaymiller]

Summary

• Added accordion-style navigation to the sponsored events page showing events by year and region
• Replaced empty events.json with structured sponsored_events.json containing 2024 and 2025 event data
• Updated sponsored events page template to display events organized by year with collapsible sections
• Removed JetBrains logo from sponsors section
• Added proper event categorization by geographic regions (Africa, North America, South America)

Test plan

• Verify the sponsored events page loads correctly at /sponsored-events
• Test that accordion sections expand and collapse properly
• Confirm all event data displays correctly within regional categories
• Validate the layout is responsive and accessible
• Check that the current year (2025) accordion is open by default

🤖 Generated with Claude Code

[kjaymiller]

[dragid10]

I really dig the look!