chore: organise modules

Organise modules in a significantly better way with categories.

modules/desktop/de/niri.nix

@@ -0,0 +1,26 @@
+{ config, lib, pkgs, ... }:
+
+{
+  programs.niri.enable = true;
+  # Optional, hint electron apps to use wayland:
+  environment.sessionVariables.NIXOS_OZONE_WL = "1";
+
+  programs.xwayland.enable = false;
+
+  environment.systemPackages = with pkgs; [
+    waybar
+    swww
+    wl-clipboard
+    brightnessctl
+    helvum
+    walker
+    playerctl
+    swaynotificationcenter
+    hyprshot
+    matugen
+    pywalfox-native
+    hyprshade
+
+    xwayland-satellite
+  ];
+}