Docs: suggest IRC for non-account chat

README.md

@@ -65,6 +65,5 @@ that chat window open because it can easily take a few hours for
 someone to notice a message.
 Matrix is persistent, and we'll see your message eventually.
 
-* [![Join us on Matrix](https://img.shields.io/badge/Matrix-%23calamares:kde.org-blue)](https://webchat.kde.org/#/room/%23calamares:kde.org) (KDE webchat, may need an account)
-* [![Join us on Matrix](https://img.shields.io/badge/Matrix-%23calamares:kde.org-blue)](https://app.element.io/#/room/%23calamares:kde.org) (Element webchat)
-* [![Chat on IRC](https://img.shields.io/badge/IRC-Libera.Chat%20%23calamares-green)](https://kiwiirc.com/client/irc.libera.chat/#calamares)
+* [![Join us on Matrix](https://img.shields.io/badge/Matrix-%23calamares:kde.org-blue)](https://webchat.kde.org/#/room/%23calamares:kde.org) (needs a Matrix account)
+* [![Chat on IRC](https://img.shields.io/badge/IRC-Libera.Chat%20%23calamares-green)](https://kiwiirc.com/client/irc.libera.chat/#calamares) (IRC supports guest accounts)