Delete a local group
-This API lets a server admin delete a local group. Doing so will kick all -users out of the group so that their clients will correctly handle the group -being deleted.
-The API is:
-POST /_synapse/admin/v1/delete_group/<group_id>
-
-To use it, you will need to authenticate by providing an access_token
for a
-server admin: see Admin API.