Add eirene bare metal config

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

users/common/extra.nix

@@ -1,24 +1,24 @@
 { lib, ... }:
 
 let
-  userOptions = with lib; { config, ... }: {
+  userOptions = with lib; with types; { config, ... }: {
     options.email = mkOption {
-      type = types.nullOr types.str;
+      type = nullOr str;
       description = "Email address of the user.";
     };
 
     options.fullName = mkOption {
-      type = types.nullOr types.str;
+      type = nullOr str;
       description = "Full name of the user.";
     };
 
     options.wallpaper = mkOption {
-      type = types.path;
+      type = path;
       description = "Path to the user's wallpaper.";
     };
 
     options.base16Scheme = mkOption {
-      type = types.path;
+      type = path;
       description = "Base16 scheme to use for the user's color palette.";
     };
   };