Update main README with the Slack links
Also remove IRC channel reference.
@@ -40,8 +40,9 @@ See our full documentation at the [docs](/docs/README.md) folder.
* [Recordings](https://www.youtube.com/playlist?list=PLj6h78yzYM2Ob01WuF-mqMxd8a_wAuppb)
* Channels
- * [![Slack Channel](https://img.shields.io/badge/Slack:-%23nsm%20on%20CNCF%20Slack-blue.svg?style=plastic&logo=slack)](https://cloud-native.slack.com/messages/CHQNNUPN1/files/FHU5KB3PW/#nsm)
- * [![IRC](https://www.irccloud.com/invite-svg?channel=%23networkservicemesh&amp;hostname=irc.freenode.net&amp;port=6697&amp;ssl=1)](http://webchat.freenode.net/?channels=networkservicemesh)
+ * [![Slack Channel](https://img.shields.io/badge/Slack:-%23nsm%20on%20CNCF%20Slack-blue.svg?style=plastic&logo=slack)](https://cloud-native.slack.com/messages/CHQNNUPN1/)
+ * [![Slack Channel](https://img.shields.io/badge/Slack:-%23nsm--dev%20on%20CNCF%20Slack-blue.svg?style=plastic&logo=slack)](https://cloud-native.slack.com/messages/CHSKJ4849/)
+ * [![Slack Invite](https://img.shields.io/badge/Slack-CNCF%20Slack%20Invite-blue.svg?style=plastic&logo=slack)](https://slack.cncf.io/)
* Mailing list
* [![Mailing list](https://img.shields.io/badge/Mailing%20List-networkservicemesh-blue.svg?style=plastic")](https://groups.google.com/forum/#!forum/networkservicemesh)
