fix: remove nested domains folder

domains/domains/_vercel.vugiahung.json

@@ -1,11 +0,0 @@
-{
-  "description": "Vercel verification for vugiahung.is-a.dev",
-  "repo": "https://github.com/vu-gia-hung/Portfolio",
-  "owner": {
-    "username": "vu-gia-hung",
-    "email": "29vu07gia07hung@gmail.com"
-  },
-  "records": {
-    "TXT": "vc-domain-verify=vugiahung.is-a.dev,2829fc6e34d31ebdee2e"
-  }
-}