Updated nginx documentation to include image server instructions

[sohmc]

This PR provides additional information to serve tandoor images from an nginx reverse proxy by bind-mounting the mediafiles directory and then serving the images directly from the server, and resolves #2796

Please feel free to make modifications to the documentation as needed to fit the style of the existing style.

Code/configuration released under AGPL. I'm not sure how you all are releasing your documentation. Let me know what license you need and happy to release it under those terms.

[vabene1111]

The standard nginx config included in the docker image already does the media serving part so I dont really understand why you want to add the explanation (which is on its own correct) should be added to the docs as people just need to use the container provided

see https://github.com/TandoorRecipes/recipes/blob/develop/nginx/conf.d/Recipes.conf#L8

[sohmc]

The documentation as currently provided does not mention Recipes.conf at all. The example given under Pure Nginx does not include the /media location context, nor does it describe how to use nginx to serve images.

[ignas-poklad]

You're missing static files... Mine looks like this:

location /media/ {
  alias /static_files/recipes/media/;
  autoindex off;
}

location /static/ {
  alias /static_files/recipes/static/;
  autoindex off;
}

I too don't use the default config as I see no benefit in having Nginx behind another Nginx. If you're running only recipes alone or you're having a hard time with the Nginx config, then maybe it makes sense. Otherwise, it's a waste of CPU and RAM for no benefit. What I do is share the media and static volumes between the recipes container and my main Nginx proxy has these config lines.