Flattened chapter structure.

Added basic Manage Services chapter, and placed Identity and Compute sections inside. Redid Compute section header to match. Removed installation instructions (user should already have installed).

Change-Id: Iffb15804ea7c3b6e6ebed526fdd17c4e125184a8
Add "region" to glossary.

Change-Id: I8c66214088cc6c12f5fe16b962644dc9cae57aeb
Merge "Add "region" to glossary."