chore: organise modules

Organise modules in a significantly better way with categories.

modules/linux/niri.nix

@@ -1,26 +0,0 @@
-{ 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
-  ];
-}