Update JSON structure for domain configuration

I actually read the documentation this time :/

domains/ahsantuf.json

@@ -1,10 +1,14 @@
 {
+  "repo": "https://github.com/ahsanTUF/ahsanTUF-Portfolio-Website",
   "owner": {
     "username": "ahsanTUF",
     "email": "thsanauf@gmail.com"
   },
-  "record": {
-    "CNAME": "cname.vercel-dns.com"
+  "target": {
+    "CNAME": {
+      "name": "ahsantuf",
+      "value": "cname.vercel-dns.com"
+    }
   },
   "proxied": false
 }