These links connect to the available shopping cart displays.
If you are going to use one of these displays, choose the one that is appropriate to you and add your own styles to match your site. The other displays can be deleted from your server if they are not being used to avoid confusion. So for instance, if are not using the /cart/ displays then you can just delete the /cart/ folder from your web server.
If you are adding buy now buttons by hand to your existing web pages, then you can remove all the following folders from your web site.