refactor: rename modules to nixosModules

modules/desktop.nix

@@ -1,40 +0,0 @@
-{ pkgs, ... }:
-{
-  environment.systemPackages = [
-    pkgs.mpv # video player
-    pkgs.amberol # music player
-    pkgs.alacritty
-    pkgs.ghostty
-    pkgs.libreoffice
-    pkgs.nautilus
-  ];
-
-  fonts.packages = [
-    pkgs.inter
-  ];
-
-  programs.firefox = {
-    enable = true;
-    languagePacks = [ "fr" ];
-  };
-
-  programs.thunderbird.enable = true;
-
-  programs.nautilus-open-any-terminal = {
-    enable = true;
-    terminal = "ghostty";
-  };
-
-  services.pcscd.enable = true;
-
-  services.displayManager = {
-    sddm.enable = true;
-    sddm.wayland.enable = true;
-  };
-
-  # Display manager keyboard layout
-  services.xserver = {
-    enable = true;
-    xkb.layout = "fr";
-  };
-}