The Steem Slack got deleted?!

Hey Steemers,

So, I'm new here and I'm reading up on stuff like Hive account@lehard's Steemit For Dummies post & Hive account@cryptoctopus's How to #introduceyourself post, and I keep hearing about the Steem Slack channel.

The URL to sign up for it is, apparently, http://steem.herokuapp.com/. But visiting it throws an Application Error.

Is the Steem Slack channels still alive? If yeah, where can new users sign up?