We include all of our Theme Specific documentation within the demo sites themselves. For example if you wanted to see the Widget Positions layout you would go here:http://shape5.com/demo/wp/metro-shows/features/vertex-features/widget-position
All of the additional documentation that is specific to the Theme can be viewed under the menu item drop downs on the link above. If you would like to view Tutorials specific to Vertex or Installation we have an entire Documentation Hub here:http://www.shape5.com/index.php?option=com_documentation&Itemid=260
If you have any questions not covered in those areas please let us know and we will be happy to assist.