Removing the Upstream Institute meetings

The team decided to use the ML and IRC channel and skip the weekly
meetings. We will add the meeting back later in case needed.

Change-Id: I80c22df0c41b9b0fe10c9149b8a0a6397e3fe0df

meetings/upstream-institute.yaml

@@ -1,17 +0,0 @@
-project: OpenStack Upstream Institute
-meeting_id: openstack_upstream_institute
-agenda_url: https://etherpad.openstack.org/p/openstack-upstream-institute-meetings
-schedule:
-  - time:       '2000'
-    day:        Monday
-    irc:        openstack-meeting-3
-    frequency:  biweekly-odd
-    start_date: 20180827
-chair: Ildiko Vancsa (ildikov)
-description:  >
-  This is the meeting series for the OpenStack Upstream Institiute
-  horizontal team which is working on providing the Upstream
-  Collaboration Trainings prior to the Summits and as part of
-  smaller local events. The meeting is needed to discuss the training
-  format and content along with the actual topics in connection to
-  on-boarding new contributors to OpenStack.