Add favicons/manifest and update Vercel rewrites

Add multiple favicon assets (android-chrome-192/512, favicon-16/32, favicon.ico) and site.webmanifest to landing/public; update apple-touch-icon.png. Remove unused SVGs (next.svg, vercel.svg) and delete website-checklist.md. Update vercel.json rewrites to point docs to https://undyingterminal.mintlify.dev instead of .app.

Author: Microck

landing/public/android-chrome-192x192.png

@@ -0,0 +1 @@
+{"name":"","short_name":"","icons":[{"src":"/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},{"src":"/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}],"theme_color":"#ffffff","background_color":"#ffffff","display":"standalone"}

landing/public/android-chrome-512x512.png

@@ -46,11 +46,11 @@
   "rewrites": [
     {
       "source": "/docs",
-      "destination": "https://undyingterminal.mintlify.app/docs"
+      "destination": "https://undyingterminal.mintlify.dev/docs"
     },
     {
       "source": "/docs/(.*)",
-      "destination": "https://undyingterminal.mintlify.app/docs/$1"
+      "destination": "https://undyingterminal.mintlify.dev/docs/$1"
     }
   ],
   "buildCommand": "cd landing && npm install && npm run build",