Remove Large Scale SIG meeting

Stop holding separate Large Scale SIG meetings, and join Ops Radio Hour
instead.

Change-Id: I5d41cc00bb662c6cf204b15d19082241daa145b2
Signed-off-by: Thierry Carrez <thierry@openstack.org>

meetings/large-scale-sig-meeting.yaml

@@ -1,17 +0,0 @@
-project:  Large Scale SIG Meeting
-meeting_id: large_scale_sig
-agenda_url: https://etherpad.openstack.org/p/large-scale-sig-meeting
-schedule:
-  - time:       '1400'
-    day:        Wednesday
-    irc:        openstack-operators
-    frequency:  fourth-wednesday
-    start_date: 20250529
-chair:  >
-  Thierry Carrez (ttx), Arnaud Morin (amorin), Felix Huettner (felix.huettner)
-description:  >
-  Facilitating the scaling journey of OpenStack operators since 2019! Please
-  join the Large Scale SIG meeting if you are interested in helping OpenStack
-  operators navigate from scaling up one single cluster to scaling out to
-  multiple regions, zones or cells. Anyone is very welcome to join.
-  Our documentation lives at https://docs.openstack.org/large-scale .