bug#58196: Trivial update to ediprolog

[Stefan Monnier]

> How about using python-markdown instead?  It seems to be actively
> maintained and no-frills enough.  See:
>
>     https://python-markdown.github.io/#goals
>
> It has optional extensions, such as one for tables.

I ended up using https://github.com/trentm/python-markdown2
instead.  The choice was largely arbitrary, but markdown2 was smaller,
claims to be faster, and had one less dependency.

So, from now on, tables should start working (not in existing pages,
tho: it'll only start working after a new tarball gets built).


        Stefan