dd new ds-static doc build target to generate static docs (only) for devsite...

dd new ds-static doc build target to generate static docs (only) for devsite without resolving @links. am: b042ab1e am: d66ec65b am: 7e7ea763
am: c05521b4

Change-Id: I6341a4d027654329209241d1955b90efd02f910e