Archive of non-posts?

[fredrikaverpil]

I've got a contents/posts folder but I also have contents/cheat-sheets. I'd like to create an archives page for the cheat-sheets. Is this not possible?

I'm creating this, but all entries shown are posts, not cheat-sheets:

---
title: Cheat-sheets archive
url: /archive/
layout: archives
type: "cheat-sheets"
---