Fix Version/s: 1.6
This was originally a task for marketing, but after proofreading the introduction of the Nexus book I've realized that we don't have enough development of the topic of repository management. We need a section in the introduction that discusses why you need to incorporate a repository manager into your development cycle.
We also might want to consider reusing this content in the Maven definitive guide. When we removed the Nexus chapter from the definitive guide we also lost an important way to direct people's attention to repository managers. There needs to be some content in the Maven def guide that discusses the imperative of using a repository manager.