Pybrick chat moved to a better platform

[shmezi]

The current Gitter chat is basically useless atm at least as no one looks in it. I feel a small discord server could help create an actual community for Pybricks.

[dlech]

We have a #lego-and-pybricks channel already on the MicroPython Discord. You are welcome to join us there.

https://discord.gg/mAj7NKhgWe

[laurensvalk]

Discord membership could also be a perk for Patreon sponsors.

Some pages have this. Haven't looked at how to set this up yet.