fixes #7201 - Remove 'Lifecycle Management' and move environments to 'Lifecycle Environments'

This commit is just a minor change to clean up a couple of things:
1. remove Lifecycle Management (which is covered by the content in 2 below)
2. move the content in environments to lifecyle_environments

Note: no change was made to the content of Lifecyle Environments.
Merge pull request #31 from bbuckingham/issue-7201

fixes #7201 - Remove 'Lifecycle Management' and move environments to 'Lifecycle Environments'