Show Blackbox Create Buttons

The Whitebox and Blackbox doctypes do not provide their own homepage since they are always added as subdocuments. Therefore these doctypes are not promoted.

Users may choose these doctypes from the wizard, but need to click the "Show more" button to have access to the doctype's blueprint wizard.

Having these doctype not promoted is correct, but the templates with the Create Buttons for Whitebox and Blackbox documents should be shown by default.