Moving Engagement List to Discourse

[sri ramkrishna me]

I brought this up in Telegram but didn't receive any objections.

The GTK team are moving to discourse and I asked Neil if he could move
us as well.  Mailman is a sad anachronistic technology to be sent to
the garbage bin.  As well, maintenance is a pain because of all the
spam.  Moving to discourse has proven to improve discussions by those
who have moved from it.

If you have objections, please speak up.  You can still interact by
mail like you could previously so you won't see too much change.  But I
hope we will have good experience by being to have more and better
conversations.

If you have no objection, say nothing and I'll work on moving us out as
soon as GTK gets finished.  I'll move the rest of the engagement like
lists that I manage as well.

Cheers,
sri