Added configuration file for docs-draft.

This adds a config.json file configured so that any docs-draft build
will be able to consume the api at storyboard.openstack.org. For more
information, see https://review.openstack.org/#/c/124211/

This patch won't actually do anything until the js-draft build
has been taught to upload this file.

Change-Id: I03a5be78e6188b51f7221fe782f6a7792b55a79f
Merge "Added configuration file for docs-draft."