feat: redesign schedule component with expandable events and detailed…

[jhermesn]

This pull request refactors the Schedule component in src/components/Schedule.tsx to introduce a more structured and interactive schedule display. Key changes include a new data structure for events, improved UI components, and added functionality for expandable event details.

Data Structure Enhancements:

• Introduced new types/interfaces (EventType, Talk, EventContent, ScheduleEvent, ScheduleDay, ScheduleData) to provide a more detailed and structured representation of schedule data. This includes support for event-specific details like speakers, rooms, and registration links.

UI Improvements:

• Updated the design of event cards, including the use of Image components for speaker images, better styling for event types, and interactive buttons for registration links.
• Redesigned the day selection buttons with a cleaner and more responsive appearance.

New Features:

• Added the ability to expand and collapse event details, with visual indicators (ChevronDown and ChevronUp icons) and support for nested content like talks and activities.
• Implemented helper functions like toggleExpand and getEventTypeColor to manage state and styling dynamically.

Code Cleanup:

• Removed the old ScheduleItem structure and its related