update username for prev domain

domains/undefined.json

@@ -1,8 +1,7 @@
 {
   "description": "This subdomain is for my personal portfolio website.",
-  "repo": "https://github.com/baokhang4930/baokhang4930.github.io",
   "owner": {
-    "username": "baokhang4930",
+    "username": "actuallyundefined",
     "email": "baokhang4930@gmail.com",
     "twitter": "undefiined__"
   },