The Contents List is managed using the mediawiki software's built in categories system.
Categories provide an alternative way of finding and navigating the content page within the cider wiki. They can also be used as "tags" to pull together pages which have something in common, or just to provide some quick meta data about any page.
You can see all category codes currently in use at Special:Categories
Below is the contents list which comprises of all the categories that have been tagged "categories", many of which will have sub-categories linked to them which are not listed here, but one or two steps away. So this is a kind of top level contents lists from which you can explore onwards.
This category has the following 55 subcategories, out of 55 total.