Add Vercel verification

domains/_vercel.gokay.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "your-github-username",
+        "email": "your-email-address@example.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=gokay.is-a.dev,6d5427dbff6e7d291063"
+    }
+}