Update to (somewhat?) dendritic pattern

Heavily inspired by https://github.com/Doc-Steve/dendritic-design-with-flake-parts.

> Atomic commits? Never heard of them!

modules/system-settings/amd-gpu.nix

@@ -0,0 +1,18 @@
+{
+  flake.modules.nixos.amd-gpu = { pkgs, ... }: {
+    environment.systemPackages = with pkgs; [
+      rocmPackages.amdsmi
+    ];
+
+    boot.kernelModules = [ "kvm-amd" ];
+
+    hardware.graphics = {
+      enable = true;
+      extraPackages = [ pkgs.rocmPackages.clr.icd ];
+    };
+    hardware.amdgpu = {
+      initrd.enable = true;
+      opencl.enable = true;
+    };
+  };
+}

modules/system-settings/i18n-de.nix

@@ -0,0 +1,23 @@
+{
+  flake.modules.nixos.i18n-de = {
+    time.timeZone = "Europe/Berlin";
+
+    # Select internationalisation properties.
+    i18n.defaultLocale = "en_US.UTF-8";
+
+    i18n.extraLocaleSettings = {
+      LC_ADDRESS = "de_DE.UTF-8";
+      LC_IDENTIFICATION = "de_DE.UTF-8";
+      LC_MEASUREMENT = "de_DE.UTF-8";
+      LC_MONETARY = "de_DE.UTF-8";
+      LC_NAME = "de_DE.UTF-8";
+      LC_NUMERIC = "de_DE.UTF-8";
+      LC_PAPER = "de_DE.UTF-8";
+      LC_TELEPHONE = "de_DE.UTF-8";
+      LC_TIME = "de_DE.UTF-8";
+    };
+
+    # Configure console keymap
+    console.keyMap = "de";
+  };
+}

modules/system-settings/linux-latest.nix

@@ -0,0 +1,5 @@
+{
+  flake.modules.nixos.linux-latest = { pkgs, ... }: {
+    boot.kernelPackages = pkgs.linuxPackages_latest;
+  };
+}

modules/system-settings/nerdfonts.nix

@@ -0,0 +1,11 @@
+{
+  flake.modules.nixos.nerdfonts = { pkgs, ... }: {
+    fonts = {
+      enableDefaultPackages = true;
+      packages = with pkgs; [
+        nerd-fonts.jetbrains-mono
+      ];
+      fontDir.enable = true;
+    };
+  };
+}