Changing the folder structure will cause too many broken links for
external references (from other sites). So, let's put the content back
where it was before the reorg, and instead use the new persona-based
navigation to point to documents in the original locations.
Also, introduce redirects for some documents that no longer exits.
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
Add documentation contributing information with project specific
recommentations along with some common reST and Sphinx constructs.
Reorganize contributing section to fit this new doc in.
Also
* Cleanup stray file (CODEOWNERS) from when docs were in their own repo.
* Remove licensing footer on generated pages (not really needed).
* Pull replacement strings into substitutions.txt for easier management.
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>