Azure documentation updates for 1.7.1

Updated the Deploying Orchard to Windows Azure topic according to overhaul done in 1.7.1.
Added more Windows Azure documentation topics.
Wasn't sure what to do with the topic Deploying-Orchard-to-Windows-Azure-Web-Site-and-SQL-Database so I left it intact but removed from TOC for now - probably it needs some rework but I can't figure out the intended scope of that topic.