Add custom impermanence module

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

hosts/common/user/configs/gui/kitty/default.nix

@@ -1,5 +1,6 @@
 {
-  username ? throw "username argument is required",
+  user ? throw "user argument is required",
+  home ? throw "home argument is required",
 }:
 {
   config,
@@ -8,14 +9,12 @@
   ...
 }:
 let
-  hmConfig = config.home-manager.users.${username};
+  hmConfig = config.home-manager.users.${user};
 in
 {
-  environment.persistence."/cache".users.${username}.directories = [
-    "${hmConfig.xdg.relativeCacheHome}/kitty"
-  ];
+  environment.persistence."/cache"."${home}/.cache/kitty" = { };
 
-  home-manager.users.${username} = {
+  home-manager.users.${user} = {
     programs.kitty = {
       enable = true;
 
@@ -32,7 +31,7 @@ in
     };
 
     theme = {
-      templates."${hmConfig.xdg.configHome}/kitty/theme.conf".source = ./theme.conf;
+      templates."${home}/.config/kitty/theme.conf".source = ./theme.conf;
 
       extraConfig = "${
         lib.meta.getExe (