home: atuin: add 'package' option

modules/home/atuin/default.nix

@@ -5,11 +5,15 @@ in
 {
   options.my.home.atuin = with lib; {
     enable = my.mkDisableOption "atuin configuration";
+
+    # I want the full experience by default
+    package = mkPackageOption pkgs "atuin" { };
   };
 
   config = lib.mkIf cfg.enable {
     programs.atuin = {
       enable = true;
+      inherit (cfg) package;
 
       flags = [
         # I *despise* this hijacking of the up key, even though I use Ctrl-p