Hitting `,m` in the compose menu creates a dual txt/html email group
when the highlighted file is written in (djot) markdown.
Delete the original message afterwards to create a fully functional html
email with plaintext fallback.
Completely taken from: https://tom.wemyss.net/posts/neomutt-markdown-email/
with many thanks. What an amazing use of pipelines in neomutt!
Similarly to the qutebrowser module we change the layout to have a
program name at the top-level and all required files for that specific
program within, whether they reside within .config, .local or anywhere
else.
We use dotter mappings to achieve this.