Add xdg settings, cache, cleanup script

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/common/default.nix

@@ -1,4 +1,4 @@
-{ inputs, ... }:
+{ config, inputs, ... }:
 
 {
   imports = [
@@ -6,6 +6,7 @@
     ./options.nix
     ./configs/persist
     ./configs/sops
+    ./configs/xdg
   ];
 
   home-manager = {
@@ -15,6 +16,7 @@
     sharedModules = [{
       home.stateVersion = "24.05";
       systemd.user.startServices = "sd-switch";
+      nix.settings = config.nix.settings;
     }];
   };