Allow the use of markdown to compose posts.
The trickiest part is how to handle metadata. Everything should just work if we include the metadata in the .lisp file, but that's not as convenient.
So, should the markdown have some sort of header which is skipped? Perhaps something like an RFC822 thing:
Title: abc
Tags: t1 t2
Date: 2022-10-15 10:56
The body
* using markdown
* etc.
danmcd found a promising looking markdown library: http://github.com/mity/md4c