Update Vercel domain configuration with new credentials

domains/_vercel.vkov.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "echo-vladimir",
+    "email": "echo.vladimir.k@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=vkov.is-a.dev,ce91fcbcbd555dd7cdee"
+  }
+}