Add custom impermanence module

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

hosts/common/user/configs/gui/cbatticon/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,
@@ -8,7 +9,7 @@
   ...
 }:
 {
-  home-manager.users.${username} = {
+  home-manager.users.${user} = {
     services.cbatticon = {
       enable = true;
       lowLevelPercent = 20;