Use privacy-friendly community platform instead of discord

[Kreyren]

LBRY currently uses discord which doesn't honor Do Not Track, requires a phone verification and sells personal user data.

Consider the use of https://matrix.org/ instead -or- set up a bridge from matrix to provide alternative with the same chat content.

See https://tosdr.org/en/service/536 for details

[kauffj]

@LBRYFoundation runs the discord, not @lbryio