restrict deferring icons to the component (#239)

small hint, that his feature doesn't work with the blade directive or the helper function

README.md

@@ -428,6 +428,8 @@ This will push the icons to the stack "bladeicons", you should load this stack a
 </html>
 ```
 
+Deferring icons is only possible using the `<x-icon>` component. This [feature doesn't work](https://github.com/blade-ui-kit/blade-icons/issues/194#issuecomment-1175156423) with the `@svg` Blade directive or the `svg()` helper function.
+
 ##### Using deferred icons in JavaScript
 
 You can re-use your icons from blade in your JavaScript rendered views by providing a custom defer value that will be used as an identifier: