How do I show a lightning page: https://dorothy.lightning.force.com/lightning/r/ContentDocument/069f1000002wZh7AAE/view
without the yellow area at top?
Bill, unfortunately Lightning Experience does not allow you to remove the header / footer. If you want to have a page that has absolutely no Salesforce branding / header / footer, you will need to use a Visualforce Page.
Is it possible to get the functionality of the viewing of documents within Skuid?