Add documentation for Nginx configuration with CKAN

[nigelbabu]

We use Nginx and Apache and this needs to be documented.

[nigelbabu]

I'm going to push this to 2.2, to land after the doc reorg has landed.

[seanh]

@nigelbabu Any update on this one?

[nigelbabu]

I'll add this to my list for next week.

[nigelbabu]

@seanh How do you want me to write this documentation? Should I add it as an alternative or should I ask everyone to use Nginx?

[amercader]

I think we should only explicitly mention how to use Nginx in the source deploy instructions (which already mention Nginx but don't explain how to use it)

http://docs.ckan.org/en/latest/deployment.html

[nigelbabu]

The complication is that in the package we have Nginx reverse proxying Apache.

[amercader]

I think is fine to recommend the apache-nginx setup for source installs as well if we are using it for the package install. We can change the port in step 5, explain why are we using nginx and add an extra step 6 for the nginx conf file. Or if you prefer add it as an optional step at the end.