Update the versions of tools used to generate documentation locally and
include a description of the message filtering now included in the doc
build Makefile (formerlly only done in the CI scripts).
Also, include the documentation docs in the developer guides to help
folks that want to contribute and generate docs locally.
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
Simplify top-level table of contents and create the user guide which
includes the application development primer and other guides and
refereces instead of having them at the top-level.
Also move glossary section away from top-level TOC and remove broken
search link.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>