Consolidate www TXT verification into existing _vercel.jithesh-gopinathan.json

Per maintainer guidance (doughmination, gameroman): all Vercel TXT
ownership-verification records for a user go into the single
_vercel.[DOMAIN].json file as an array, regardless of which specific
subdomain each one verifies. Moved the www verification value into
the existing file's TXT array and removed the separate
_vercel.www.jithesh-gopinathan.json file.

domains/www.jithesh-gopinathan.json (the CNAME for the www subdomain
itself) is unchanged -- only the TXT verification file structure was
flagged.

domains/_vercel.jithesh-gopinathan.json

@@ -7,7 +7,8 @@
   },
   "records": {
     "TXT": [
-      "vc-domain-verify=jithesh-gopinathan.is-a.dev,8ccd018398d1a54f97ef"
+      "vc-domain-verify=jithesh-gopinathan.is-a.dev,8ccd018398d1a54f97ef",
+      "vc-domain-verify=www.jithesh-gopinathan.is-a.dev,3a62b2f626fc5d0d997b"
     ]
   }
 }

domains/_vercel.www.jithesh-gopinathan.json

@@ -1,9 +0,0 @@
-{
-  "owner": {
-    "username": "jitheshlive",
-    "email": "jitheshlive@gmail.com"
-  },
-  "records": {
-    "TXT": "vc-domain-verify=www.jithesh-gopinathan.is-a.dev,3a62b2f626fc5d0d997b"
-  }
-}