refactor: import nixosModules unconditionally, add enable options

nixosConfigurations/ronja-pc/default.nix

@@ -1,20 +1,15 @@
-{
-  config,
-  pkgs,
-  self,
-  ...
-}:
+{ pkgs, ... }:
 {
   imports = [
     ./hardware.nix
-    self.nixosModules.user-ronja
-    self.nixosModules.gnome
-    self.nixosModules.steam
-    self.nixosModules.wine-gaming
-    self.nixosModules.muede-desktop-settings
   ];
 
   config = {
+    my.users.ronja.enable = true;
+    my.steam.enable = true;
+    my.wineGaming.enable = true;
+    my.muedeDesktopSettings.enable = true;
+
     # Configure keymap in X11
     services.xserver.xkb = {
       layout = "de";
@@ -24,8 +19,6 @@
     # Configure console keymap
     console.keyMap = "de";
 
-    # List packages installed in system profile. To search, run:
-    # $ nix search wget
     environment.systemPackages = with pkgs; [
       #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
       #  wget