This is based roughly on

  http://clarkdave.net/2012/02/building-a-static-blog-with-nanoc/

with a lot of small modifications to make it fit the existing docs site.

Blog posts should be added as:

    content/blog/YYYY-MM-DD-post-title.md

They need to state the title, kind, created_at, and author in the
frontmatter, e.g.:

    ---
    title: "This is a blog post title"
    created_at: 2015-04-22
    kind: article
    author: Julius Volz
    ---