Include the nexus domain(s)

entities.nix

@@ -4,6 +4,7 @@ let import-by-basename = helper-lib.fs.import-by-basename;
 in {
   domains = import-by-basename ./domains;
   hosts = import-by-basename ./hosts;
+  nexus.domains = import-by-basename ./nexus;
   sites = import-by-basename ./sites;
   zones = import-by-basename ./zones;
 }