Remove Discord chat badge from README

Removed Discord chat badge from README.

Author: timunie

README.adoc

@@ -31,7 +31,6 @@ If you have feedback, questions or suggestions feel free to contact us via:
 
 image:https://raw.githubusercontent.com/Patrolavia/telegram-badge/master/chat.svg[link=https://t.me/Avalonia]
 image:https://badges.gitter.im/Join%20Chat.svg[link=https://gitter.im/AvaloniaUI/Avalonia?utm_campaign=pr-badge&utm_content=badge&utm_medium=badge&utm_source=badge]
-image:https://img.shields.io/badge/discord-join%20chat-46BC99[link=https://aka.ms/dotnet-discord]
 
 Or file a new bug-report or feature request in the https://github.com/AvaloniaUI/Avalonia.Samples/issues[`Issues`]-section.