MB-7541: remote "Developer Preview" from page title

Change-Id: Idf5de5f0c8892a1a60efa7f320c123471eb340d2
Reviewed-on: http://review.couchbase.org/24062
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>