Category Previews

[tshenry (Taylor)]

As luck would have it, I just added support for the “Boxes with Subcategories” desktop category page style

https://github.com/tshenry/discourse-category-previews/commit/6dcdb39f196237f981ecf73af4903c0d9e4da2e6

Note that “Boxed with Featured Topics” is still not supported yet.