Delete domains/lab.prithvi.json

The subdomain is not yet required as the work is still in progress, I will add it at a later date. Just the MX records are fine for now.

domains/lab.prithvi.json

@@ -1,9 +0,0 @@
-{
-    "owner": {
-        "username": "PrithviRe",
-        "email": "pprithvi2006@gmail.com"
-    },
-    "records": {
-        "CNAME": "lab.prithvire.dev"
-    }
-}