Improving the Installation Guide: Basic Environment

Updating the file name, chapter title, and xrefs for the
basic environment section in the installation guide.

Change-Id: I89700ac61c08a7332c1dcf01a4018f26d92d9d5d
backport: none
Closes-Bug: #1362946
Implements: blueprint installation-guide-improvements
Merge "Improving the Installation Guide: Basic Environment"