chore: add vercel.json to project root folder (#130)

- Issue #128 from docs-pt

- Issue #2560 and #2664 from vuejs/docs

Contribution did by @viniciusdeliz

vercel.json

@@ -0,0 +1,29 @@
+{
+    "$schema": "https://openapi.vercel.sh/vercel.json",
+    "headers": [
+      {
+        "source": "/assets/(.*)",
+        "headers": [
+          {
+            "key": "Cache-Control",
+            "value": "max-age=31536000, immutable"
+          }
+        ]
+      },
+      {
+        "source": "/(.*).png",
+        "headers": [
+          {
+            "key": "Cache-Control",
+            "value": "max-age=604800, immutable"
+          }
+        ]
+      }
+    ],
+    "rewrites": [
+      {
+        "source": "/:path*",
+        "destination": "/:path*.html"
+      }
+    ]
+}