Resurrect mdoc

[larsrh]

Because of the impending Bintraypocalypse I've removed all traces of tut from this repository, by "simply" generating the Markdown files once and for all. The resulting files are then committed to the _posts directory (commit 2df8047).

If anyone would like to take a stab at reverting parts of that and switching to mdoc, feel free to. I opened this ticket so that future generations will know what happened on April 14, 2021.

[rossabaker]

That seems totally reasonable for everything rendered in the past. For future posts, we'll need to bring a new mdoc architecture, or render them ourselves?

[larsrh]

I'd lazily evaluate that question 😉