As part of the new organizational deployment guide, we need to
document a supported and tested repository solution. For this we
will use Sonatype Nexus Repository OSS edition.

…n, and blob stores

This commit adds information into the Nexus installation portion of the new Organizational deployment guide
which covers cleanup policy with included link to Nexus documentation, authentication with link to Nexus
documentation, and blob stores with included link to Nexus documentation.