fix: move vercel.json to wwwroot for SPA routing.

BlazorWebAssembly/vercel.json

@@ -1,8 +0,0 @@
-{
-  "rewrites": [
-    {
-      "source": "/(.*)",
-      "destination": "/index.html"
-    }
-  ]
-}

BlazorWebAssembly/wwwroot/vercel.json

@@ -0,0 +1,10 @@
+{
+  "cleanUrls": true,
+  "routes": [
+    { "handle": "filesystem" },
+    {
+      "src": "/.*",
+      "dest": "/index.html"
+    }
+  ]
+}