Publish Config Ref and Install Guide for Juno as well

Copy over the Config Ref and Install Guide to juno locations until
we branch of Juno.

Add juno/index.html page - but do not add external links to it yet,
let's first see that everything works fine.

Change-Id: I3a2533a4d25659860e6578cd84b15fa82dd3c269
Merge "Publish Config Ref and Install Guide for Juno as well"