Documentation updates were needed to account for changes caused by the
recent merging of the three acrn-hypervisor, acrn-devicemodel, and
acrn-documentation repos.
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
Add the "Introduction of Project Acorn" doc.
Also adds improvements to the doc generation processes, content styles,
removed doxygen-generated API material.
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>