common: move to modules, move some files out, modules: adjust dir structure

modules/nixos/system/desktop.nix

@@ -0,0 +1,40 @@
+{ config, pkgs, ... }:
+
+{
+  networking.networkmanager.enable = true;
+
+  hardware = {
+    bluetooth = {
+      enable = true;
+      powerOnBoot = true;
+    };
+
+    # mesa graphics library
+    graphics.enable = true;
+  };
+
+  # audio
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+  };
+  security.rtkit.enable = true;
+
+  # CUPS
+  services.printing.enable = true;
+
+  # enable native wayland in chromium/electron
+  environment.sessionVariables.NIXOS_OZONE_WL = "1";
+
+  environment.systemPackages = with pkgs; [
+    bitwarden
+    krita
+    vlc
+    gpu-screen-recorder-gtk
+  ];
+
+  # needed alongside the GUI app for promptless recording
+  programs.gpu-screen-recorder.enable = true;
+}