Kickstarter to create Documents and Contents ... very WIP ... do not use this.
./flow kickstart:sitepackage Vendor.Site
./flow kickstart:document Vendor.Site SpecialPage --property author:string --property date:datetime
./flow kickstart:content Vendor.Site Figure --property text:richtext --property image:image
All exceeding arguments are used as property definitions.
The following property types are supported: string, bool, datetime, plaintext, richtext, image, images, asset, assets, reference, references