fix: testing headers

vercel.json

@@ -2,7 +2,7 @@
   "public": true,
   "headers": [
     {
-      "source": "/(.*)",
+      "source": "/",
       "headers": [
         {
           "key": "Access-Control-Allow-Origin",
@@ -22,6 +22,27 @@
         }
       ]
     },
+    {
+      "source": "/plus/",
+      "headers": [
+        {
+          "key": "Access-Control-Allow-Origin",
+          "value": "https://plus.excalidraw.com"
+        },
+        {
+          "key": "X-Content-Type-Options",
+          "value": "nosniff"
+        },
+        {
+          "key": "Feature-Policy",
+          "value": "*"
+        },
+        {
+          "key": "Referrer-Policy",
+          "value": "origin"
+        }
+      ]
+    },
     {
       "source": "/:file*.woff2",
       "headers": [
@@ -49,6 +70,9 @@
       ]
     }
   ],
+  "rewrites": [
+    {"source": "/plus/", "destination": "https://plus.excalidraw.com/"}
+  ],
   "redirects": [
     {
       "source": "/webex/:match*",