Document non-gunicorn based approaches for deployment

[asvetlov]

1. Just starting server.
2. Pushing multiple server processes behind nginx. Nginx config template should be attached.

[allan-simon]

what are the advantages/drawbacks of both approach as I think it's good to know why there's an alternative ? I already made for tornado a deployment like you described , nginx with a upstream configured to round-robin accross different processes handled by supervisor so if that's what you looking for, I can create a PR :)

[asvetlov]

You are getting rid of intermediate (gunicorn) but should control/monitor your services by external tool (supervisord or similar).

I very appreciate a contribution into this part of doc.
Looks like I cannot find a time for fixing the issue by myself.

[allan-simon]

I see I think I need to read a bit more about how gunicorn is working, because I always thought it was only for traditionnal sync framework and that it would not play well with asyncio ones (or at least it will hurt 'peformances' by inducing extra buffering etc. )

[asvetlov]

Gunicorn does hurt performance but overhead is relative low.

[ssolari]

+1 this would be awsome. Since I was having problems with gunicorn #1223, I tried to run aiohttp web.run_app behind nginx without gunicorn, but couldn't get things to work. Tried just proxy_pass to the 127.0.0.1 port but no go. I'm not sure what i was doing wrong. nginx isn't that easy to understand and the interactions between webservers is really tricky.

[moden-py]

Search does not work for Nginx+Gunicorn section in deployment.rst.
Steps to reproduce:

1. open https://aiohttp.readthedocs.io/en/stable/
2. Type 'Gunicorn' in the Quick search field, press Go
3. Click on 'Deployment using 'Gunicorn' result
   Actual result: 'This page does not exist yet.'

I'm not sure why, but the 'Gunicorn' result leads to http://aiohttp.readthedocs.io/en/stable/gunicorn.html?highlight=Gunicorn url, although it should lead to some /deployment.html?highlight=Gunicorn

I was unable to find the mistake in deployment.rst.

[asvetlov]

Fixed by aiohttp==1.1.1

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