add features.applications.shellScripts option

uses a custom function from my helper flake to convert a basic attrset of strings into a format `home.file` will accept

modules/global/options.nix

@@ -56,9 +56,16 @@
         };
       };
       
-      features.applications.extraPackages = lib.mkOption {
-        type = lib.types.listOf (lib.types.package);
-        default = [];
+      features.applications = {
+        shellScripts = lib.mkOption {
+          type = lib.types.attrsOf (lib.types.str);
+          default = [];
+        };
+
+        extraPackages = lib.mkOption {
+          type = lib.types.listOf (lib.types.package);
+          default = [];
+        };
       };
     };
   };