For Pier wiki pages, there is an option Edit Design that uses the PRDesignCommand to edit the environment page for the current structure (it requires one to be logged in). Recently this brings up a seaside walkback with: Message not understood: PRDocument>>#environment - the document does not have an environment, it is the structure that has an environment.
As an example, this page uses a different Template that removes the header (here's a link to the parent page). Details on CSS are on Changes For Pier.
To remove the Edit Design button the class PRDesignCommand can be removed. Newer baselines for Pier exclude the Pier-Design package that has this class (similar to Remove PierAdmin from Baseline).