dev-manual: Converted sections for following best layer practices

The section about following best practices was more of a reference
section the way it was written.  I recast the section and the
sub-sections such that it is a list of items to consider.

Also renamed the section to be more of an action section rather
than passive.

(From yocto-docs rev: 8b050a46c67a3d3e89d905cf028eec6ae370388a)

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

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