Use rewrites instead of routes for Vercel

Author: script3r

vercel.json

@@ -5,10 +5,9 @@
     { "src": "api/*.rs", "use": "@vercel/rust" },
     { "src": "www/**", "use": "@vercel/static" }
   ],
-  "routes": [
-    { "src": "/api/(.*)", "dest": "/api/$1.rs" },
-    { "handle": "filesystem" },
-    { "src": "/", "dest": "/www/index.html" },
-    { "src": "/(.*)", "dest": "/www/$1" }
+  "rewrites": [
+    { "source": "/api/:path*", "destination": "/api/:path*.rs" },
+    { "source": "/", "destination": "/www/index.html" },
+    { "source": "/:path*", "destination": "/www/:path*" }
   ]
 }