CBLT-319:  remove Sync Gateway from soon-to-be-obsolete mobile dashboard
(Product specific dashboards will replace this)

Change-Id: I42fe45d7478ba6c5ee88c8d4f0d982c01799eab8
Reviewed-on: http://review.couchbase.org/39031
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>