Move Doxyfile files to docs and associated makefile. This is a prelude to allowing a docs directory for all the RST files as well as expanding the makefile to build the docs for those too, not just the doxygen output.
The doxygen html has been moved to build/docs/html so it's not in a source directory.
Gitignore has been fixed to allow files in docs now without complaining.
BUG=
R=stichnot@chromium.org
Review URL: https://codereview.chromium.org/
1562703002 .
Patch from Reed Kotler <rkotlerimgtec@gmail.com>.
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