Improve Architecture section

[marcosgm]

http://spinalstack.enovance.com/en/latest/architecture.html

The Image is OK, but we need to explain it in a 'text' mode. We need to explain (again) that SpinalStack is just our way of deploying OpenStack. And that it requires some components to be downloaded (see Download section, github links, etc), and installed (see Deployment Guide section)

Thanks!

[marcosgm]

Need to link:
http://techs.enovance.com/6838/deploying-openstack-the-enovance-way
https://github.com/enovance/openstack-yaml-infra-ref-arch/blob/master/infra.yml

And ASAP the 'enovance reference architecture' in PDF format, if it already exists in our website, which I ignore

Am I forgetting something?