This returns the url segment for the listing page.

eg. 'categories' in /my-blog/categories/category-url This is not editable at the moment, but a method is being used incase we want to make it editable in the future. We can use this method to provide logic without replacing multiple areas of the code base. We're also not being opinionated about how the segment should be obtained at the moment and allowing for the implementation to decide.