refactor(userdirs): use explicit home directory

configs/nixos/modules/desktop/utilities/userdirs.nix

@@ -1,14 +1,27 @@
 { config, lib, ... }:
-# Declares the XDG user directories, so a tool that queries them lands in a
-# well-known folder a host can relocate from one place.
+# Declares XDG user directories, so tools that query them use predictable
+# folders a host can relocate from one place.
 let
-  user = config.user.name;
+  homeDirectory = "/home/${config.user.name}";
 in
 {
   options.modules.desktop.utilities.userdirs.enable = lib.mkEnableOption "XDG user directories";
 
   config = lib.mkIf config.modules.desktop.utilities.userdirs.enable {
-    # Write ~/.config/user-dirs.dirs from the option defaults.
-    home-manager.users.${user}.xdg.userDirs.enable = true;
+    home-manager.users.${config.user.name}.xdg.userDirs = {
+      enable = true;
+      createDirectories = true;
+      setSessionVariables = true;
+
+      desktop = "${homeDirectory}/.ignoreme";
+      documents = "${homeDirectory}/docs";
+      download = "${homeDirectory}/dwn";
+      music = "${homeDirectory}/mus";
+      pictures = "${homeDirectory}/pic";
+      publicShare = "${homeDirectory}/.ignoreme";
+      templates = "${homeDirectory}/.ignoreme";
+      videos = "${homeDirectory}/vid";
+      projects = "${homeDirectory}/.ignoreme";
+    };
   };
 }