remove biocore link

external/general/remote-working/remote-working.md

@@ -20,9 +20,7 @@ There is also a set of [tutorials](https://remote.uni.lu/) prepared by the unive
 ## Communication: Instant messaging
 
 One of the recommended tools to communicate is Slack. Each research group can sign up for free and
-create their own Slack instance: www.slack.com.
-
-The BioCore team uses [this channel](https://lcsbbioinfocore.slack.com).
+create their own Slack instance on [slack.com](www.slack.com).
 
 ## Communication: Video conferencing and virtual meetings