This commit introduces a new mobile-first sponsor list and restructures the event landing pages. Key changes include:
- A new responsive sponsor list page built with Vue.js and Tailwind CSS, optimized for SEO and on-site viewing.
- The main event index page is now a QR code display for easy access to the mobile list.
- The original landing page is refactored with Tailwind CSS and moved to a new `/landing` directory.
- Umami analytics script is integrated across all pages for usage tracking.
