Add X-Robots-Tag

Author: ltm

vercel.json

@@ -1,4 +1,15 @@
 {
+  "headers": [
+    {
+      "source": "/(.*)",
+      "headers": [
+        {
+          "key": "X-Robots-Tag",
+          "value": "noindex"
+        }
+      ]
+    }
+  ],
   "redirects": [
     { "source": "/", "destination": "/docs" },
     { "source": "/docs/angular/your-first-app/2-taking-photos", "destination": "/docs/angular/your-first-app/taking-photos" },