Cleans up stray marks.
[#62996016] Upgrades nginx to 1.4.4 and provide proxy for alpine service

 - if workflow is enabled, proxy for alpine service specified by workflow.url
 - nginx 1.4.x provides proxing for websockets used by alpine service
 - use relative urls for alpine services and assets in frontend
 - it should be sufficient to specify workflow.url as http://localhost:<port> for current
   deployment style. Backend communication can occur via localhost.

wip - update enginx to 1.4.x and reverse proxy for alpine