add proxy to nginx

[markusfalk]

nginx reverse proxy cannot connect to host's localhost

• https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/
• nginx.conf as volume: https://dev.to/domysee/setting-up-a-reverse-proxy-with-nginx-and-docker-compose-29jg

[markusfalk]

https://github.com/docker/compose/issues/3800

[markusfalk]

https://stackoverflow.com/questions/38346847/nginx-docker-container-502-bad-gateway-response

[markusfalk]

So running Angular in the host to access back-ends running locally won't work:

"The host networking driver only works on Linux hosts, and is not supported on Docker for Mac, Docker for Windows, or Docker EE for Windows Server."

https://docs.docker.com/network/network-tutorial-host/#goal