chore: remove mail.boolean44.is-a.dev

domains/mail.boolean44.json

@@ -1,11 +0,0 @@
-{
-    "owner": {
-        "username": "boolean44-repos",
-        "email": "serenitypalmer10@gmail.com"
-    },
-    "record": {
-        "MX": ["mx1.improvmx.com.", "mx2.improvmx.com."],
-        "A": ["10.0.0.1"],
-        "TXT": "v=spf1 include:spf.improvmx.com ~all"
-    }
-}