Make systemdboot optional

modules/conf.nix

@@ -20,6 +20,14 @@
       '';
     };
 
+    useSystemdBootloader = lib.mkOption {
+      default = true;
+      example = false;
+      description = ''
+        use systemd bootloader.
+      '';
+    };
+
     cpu = lib.mkOption {
       # TODO: how to enable arm?
       default = "amd";

modules/programs/greetd.nix

@@ -40,7 +40,7 @@
         } --config /etc/greetd/hyprgreet.conf";
         example = "${
           lib.getExe pkgs.cage
-        } -s -- ${lib.getEze pkgs.regreet}";
+        } -s -- ${lib.getExe pkgs.regreet}";
         type = lib.types.str;
         description = "The compositor/greeter command to run";
       };

modules/programs/sway.nix

@@ -19,7 +19,7 @@
     };
   };
   config = lib.mkIf config.mods.sway.enable (
-    lib.optionalAttrs (options ? wayland.windowManger) {
+    lib.optionalAttrs (options ? wayland.windowManger.sway) {
       wayland.windowManager.sway =
         {
           enable = true;