update build_review_app.sh, remove copy of nginx configmap, specify CNAME target to be nginx-staging.artsy.net
update build_review_app.sh, remove copy of nginx configmap, specify CNAME target to be nginx-staging.artsy.net

artsy/force-public,artsy/force-public,eessex/force,eessex/force,joeyAghion/force,joeyAghion/force,eessex/force,eessex/force,joeyAghion/force,artsy/force,joeyAghion/force,artsy/force,artsy/force,artsy/force