Notarise macOS App

macOS complains that BetterDiscord is malware because Apple hasn't checked it (in typical Apple fashion.

I'd like for a team member to sign it and send it to Apple for notarisation (it's free for macOS) with each update so macOS stops complaining that it contains malware.

Alternative: have users override the prompt saying that it's malware (which at least IMO doesn't build as much user trust).