feat(event): add mobile sponsor list and refactor landing pages

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.

analysis.js

@@ -0,0 +1,10 @@
+(function () {
+  const UMAMI_SCRIPT_JS = "https://umami.tootaio.com/script.js";
+  const UMAMI_ID = "8a1eb7cf-3173-4fa2-9824-36aa300ef868";
+
+  var script = document.createElement("script");
+  script.async = true;
+  script.src = UMAMI_SCRIPT_JS;
+  script.setAttribute("data-website-id", UMAMI_ID);
+  document.head.appendChild(script);
+})();