refactor: centralise all modules

configs/default.nix

@@ -0,0 +1,37 @@
+{
+  lib,
+  hostname,
+  type,
+  modulesPath,
+  ...
+}:
+{
+  imports = builtins.concatLists [
+    # Common options for all machines.
+    [
+      (modulesPath + "/installer/scan/not-detected.nix")
+      ./boot.nix
+      ./networking.nix
+      ./nix-config.nix
+      ./programs/zsh.nix
+      ./security.nix
+      ./users.nix
+    ]
+    # Options for graphical systems.
+    (lib.optionals (type == "desktop") [
+      ./hardware/audio.nix
+      ./hardware/bluetooth.nix
+      ./programs/getty.nix
+      ./programs/hyprland.nix
+      ./programs/hyprlock.nix
+      ./stylix.nix
+    ])
+    # Options for specific hostnames.
+    (lib.optionals (hostname == "nemesis") [
+      ./hw-nemesis.nix
+      ./bootloaders/systemd-boot.nix
+      ./hardware/cpu_amd.nix
+      ./hardware/nvidia.nix
+    ])
+  ];
+}