add antergos-next.is-a.dev subdomain

domains/antergos-next.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "c-ludenberg",
+    "email": "ash8820@proton.me"
+  },
+  "records": {
+    "CNAME": "antergos-next.github.io"
+  }
+}