Change vercel config

Author: mantou132

vercel.json

@@ -1,5 +1,16 @@
 {
   "rewrites": [{ "source": "/(.*)", "destination": "/" }],
+  "headers": [
+    {
+      "source": "/(.*)",
+      "headers": [
+        {
+          "key": "Cache-Control",
+          "value": "public, max-age=31536000, immutable"
+        }
+      ]
+    }
+  ],
   "github": {
     "silent": true
   }