Add Vercel domain configuration for keir.is-a.dev

domains/_vercel.keir.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "keirsalterego",
+    "email": "keirsalterego@gmail.com"
+  },
+  "record": {
+    "TXT": ["vc-domain-verify=keir.is-a.dev,22076e1940239b275984"]
+  }
+}