Mistune updated from 0.8.4 to 2+ a while ago, however the pypi version
of mrkd was never updated to the newer API. This started breaking
recently.
In this commit we bring the quite simple mrkd file in-house, and update
it to work with the newer mistune API.
Diff between previously generated manpages and current can be found
here:
https://gist.github.com/niftynei/e2c0e4c83b899911def8a57b30f68928
Note that all the emails have been changed from
fI< to the 'correct' <fI
(This puts the underline for the link inside the starting bracket,
not outside it)