Posts are stored in folders of the format YYYYMMDD-slug, with the post itself
having a filename of index.md.
Posts start with a front-matter; three dashes, followed by a YAML block, followed by three dashes.
Front-matter specification:
title: >
String. Mandatory.
The human-friendly title for the post.
date: >
ISO-8601 Date as a String. Mandatory.
The date the post was first published.
edited: >
ISO-8601 Date as a String. Optional.
The date the post was last edited.
tags: >
List of strings. Mandatory.
The topics associated with the post.