Remove ProductPreview component (#2499)

Author: Aljullu

assets/js/components/README.md

@@ -16,10 +16,6 @@ A combination of range controls for product grid layout settings.
 
 A pre-configured SelectControl for product orderby settings.
 
-## `ProductPreview`
-
-Display a preview for a given product.
-
 ## `ProductAttributeTermControl`
 
 A component using [`SearchListControl`](https://woocommerce.github.io/woocommerce-admin/#/components/packages/search-list-control) to show product attributes as selectable options. Only allows for selecting attribute terms from one attribute at a time (multiple terms can be selected).