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!
First we unbind all existing key mappings and then we slowly build up
our own again. May be somewhat unnecessary but I have been getting
_very_ confused with neomutt mappings just popping up all over the place
and never quite sure if they were from me or default settings or where
exactly they were configured.
This provides a clean slate to build upon.