remove vercel legacy config

vercel.json

@@ -1,24 +1,21 @@
 {
-  "rewrites": [
+  "version": 2,
+  "framework": {
+    "name": "nextjs",
+    "config": {}
+  },
+  "routes": [
     {
-      "source": "/old-path",
+      "src": "/_next/(.*)",
-      "destination": "/new-path"
+      "dest": "/_next/$1"
-    }
+    },
-  ],
-  "headers": [
     {
-      "source": "/(.*)",
+      "src": "/favicon.ico",
-      "headers": [
+      "dest": "/favicon.ico"
+    },
     {
-          "key": "X-Custom-Header",
+      "src": "/(.*)",
-          "value": "My Value"
+      "dest": "/$1"
     }
   ]
 }
-  ],
-  "functions": {
-    "api/**/*.ts": {
-      "runtime": "nodejs20.x"
-    }
-  }
-}