My markdown has some extra remarks and looks like this:
---
path: "/"
date: "2018-10-12"
title: "xxxx"
description: "desccc"
---
some of the text
How can I get the description?
{
  allMarkdownRemark(
    sort: { order: DESC, fields: [frontmatter___date] }
    limit: 1000
  ) {
    edges {
      node {
        frontmatter {
          path
          title
          date
        }
      }
    }
  }
}