Create/use nginx container

[meeDamian]

What for and why exactly is nginx used right now?

Originally posted by @meeDamian in #129 (comment)

[nolim1t]

nginx is used for aggregating invoicer and soon other web services..

[meeDamian]

Great. I do think we should have sth serving static content, but we should architect a way that can work with multiple apps each wanting sth served.

I gotta look into official nginx images.

[AnotherDroog]

I've changed the nginx container we added to a lighter one (~10MB) and will be shipping it with the base image for serving Wifi Manager and Wizard html & proxying api calls