swagger-ui redesign

fixes SIS-273

Change-Id: Ia19b08580f83002c90ebdce22ba55775c35a69a5
Reviewed-on: https://gerrit.instructure.com/34683
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Duane Johnson <duane@instructure.com>
Product-Review: Duane Johnson <duane@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>