Removed general.nix as it was, essentially, the same as what configuration.nix used to be, so I reworked configuration.nix

modules/configuration.nix

@@ -50,50 +50,18 @@
   imports =
     [
       inputs.home-manager.nixosModules.home-manager
+      inputs.grub2-themes.nixosModules.default
+      inputs.nix-flatpak.nixosModules.nix-flatpak
+      inputs.stylix.nixosModules.stylix
       ./hardware-configuration.nix
-      ../plasma/plasma.nix
-      ../hyprland/hyprland.nix
-      ../niri/niri.nix
+
+      ./firefox.nix
+      ./boot-splash.nix
+      ./zsh.nix
+      ./neovim.nix
+      ./packages.nix
     ];
 
-  specialisation = {
-    "plasma" = {
-      configuration = {
-        imports = [
-          ../plasma/plasma.nix
-        ];
-
-        programs.gamemode.enable = true;
-      };
-    };
-
-    "hyprland" = {
-      configuration = {
-        imports = [
-          ../hyprland/hyprland.nix
-        ];
-      };
-    };
-
-    "minimal" = {
-      inheritParentConfig = false;
-      configuration = {
-        imports = [
-          ./minimal.nix
-        ];
-      };
-    };
-
-    "niri" = {
-      configuration = {
-        imports = [
-          ../niri/niri.nix
-        ];
-      };
-    };
-
- };
-
   # Bootloader.
   boot.loader = {
     systemd-boot.enable = false;
@@ -107,11 +75,11 @@
       efiSupport = true;
       useOSProber = true;
       #splashImage =
-      extraConfig = ''
-        menuentry "NixOS - Default" {
-          set hidden=1
-        }
-      '';
+#      extraConfig = ''
+#        menuentry "NixOS - Default" {
+#          set hidden=1
+#        }
+#      '';
     };