[Dawn] How to create a section in Shopify that lets you see where specific products are linked from (for admin users)

When you want to delete or edit product information posted on a featured page or blog post on Shopify, it can be a bit of a hassle to search for each page where you posted it. Here is an example of a simple link checker that allows administrators to check which pages are linked to the product.
(If the product handle you entered is included in the text of a blog post, page, product description, etc., it will appear in the search results.)