remove dataHost option

improve certificate directory structure

nixos/modules/default.nix

@@ -1,7 +1,3 @@
-{ lib, config, ... }:
-
-let cfg = config.lab;
-in
 {
   imports = [
     ./storage.nix
@@ -13,21 +9,4 @@ in
     ./data-sharing.nix
     ./globals.nix
   ];
-
-  # TODO: remove this option; make this explicit on the host.
-  options.lab.dataHost.enable = lib.mkOption {
-    default = false;
-    type = lib.types.bool;
-    description = ''
-      Whether this machine holds application data.
-      This enables NFS and PostgreSQL to serve this data, and sets up backups.
-      Also enables networking on the DMZ to enable serving data.
-    '';
-  };
-
-  config.lab = lib.mkIf cfg.dataHost.enable {
-    backups.enable = true;
-    data-sharing.enable = true;
-    networking.dmz.allowConnectivity = true;
-  };
 }