restructure desktop/wm and remove nur

modules/wm/default.nix

@@ -0,0 +1,16 @@
+{ pkgs, lib, config, ... }:
+
+{
+    options = {
+        desktop = {
+            wm = lib.mkOption { type = types.str; default = "sway"; };
+            taskbar = lib.mkOption { type = types.str; default = "waybar"; };
+            launcher = lib.mkOption { type = types.str; default = "bemenu"; };
+        };
+    };
+
+    config = {
+        imports =
+          (import ./ + (desktop.wm)) ++
+    };
+}