Remove Google calendar link

Remove Google calendar link as discussed in #217

group-network/README.md

@@ -4,7 +4,6 @@ Focuses on supporting networking devices.
 
 ## Meetings
 * Weekly on Wednesdays at [16:00 UTC](http://www.thetimezoneconverter.com/?t=16:00&tz=UTC)
-  *([meetings calendar](https://calendar.google.com/calendar/embed?src=ansible.com_pafenslko0e2bqjgujp8f7s0do%40group.calendar.google.com&ctz=UTC))* in `#ansible-network`
   ([ical](https://raw.githubusercontent.com/ansible/community/master/meetings/ical/network.ics))
 * [Meeting agenda](https://github.com/ansible/community/issues?q=is:open+label:meeting_agenda+label:network)
 * [Meeting notes](https://meetbot.fedoraproject.org/sresults/?group_id=network_working_group&type=team)