mega-manual: Added new dev-manual title .PNG file to Figures folder.

(From yocto-docs rev: 995e19d0c8aca03ca026409b2db5bccaa4b6552f)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>