Prototype of Release Notes restructure

I restructured the Release Notes to more closely match
the style of the Community Release Notes:  instead of having
long lists of all resolved issues and known issues, the issues
are grouped by topic and include links to the Community Release
Notes for each component (if any) and list of new features and
resolved issues as well as known issues.
I then divided the 5.1 Known Issues up by these sections, since
most of these issues will be either Resolved or Known Issues for
6.0 and it gives us a chance to see how this might all play out.

The Component Versions (nee "Supported Software") is moved to the
Release Notes from the Planning Guide.

Also created the terminology/juno article stub.

Also includes updates to the infrastructure files to produce 6.0
documentation.

Change-Id: Iff9571d0de11d78dd66a259ea485afec9a237649