Allow Images in Docs to render inline [2/2]

This small change allows documentation writers to include images
in their doc pages simply by using the  syntax.

This doc practice is documented in the formatting.md page that is
already committed.

I also moved the docs to be a child of the devguide rather than UI
information.


 .../app/models/test/attrib_instance_test.rb        |   36 ++++++++++++++++++++
 1 file changed, 36 insertions(+)

Crowbar-Pull-ID: f9b1f81ad8f45c03928d7b816b2879b540b01057

Crowbar-Release: development