title: Generating a list of pages (not posts) in a given category
body: <p>I am using Jekyll as a static generator for a website (not a blog), and I want to have an automatically generated list of all pages on my index page. Specifically, I want to have different categories and list all articles in each category separately. <a href="http://www.gwern.net/" rel="noreferrer">Here's</a> an example of what I'm describing, if you're having trouble following. Is there any way to do this in Jekyll (e.g. GitHub pages)? I've seen the <a href="http://jekyllrb.com/docs/variables/" rel="noreferrer">variables documentation page</a> but that seems specific to the blog post format.</p>