added nginx and fixed erroneous web container build and run process

[nedvedba]

Description

The purpose of this PR was to place a reverse proxy (NGINX) infront of DataFed this provides us with the ability to easily switch between containers in preparation for production where you might want push traffic to different machines in the cases of an outage, i.e. having a maintenance page.

Acceptance

Before this PR can be merged the compose file needs to be fully tested. Ideally compose would be run as part of the end-to-end tests in the CI pipeline.