Add a "Duplicate Page" option on the page menu in the NUX

It would be helpful to have a "Duplicate Page" option on the page menu when a page is already open. Currently, it is not as easy to make a copy of a page and adjust it from there in the NUX as it is to make a copy in the classic UX. If this option was available, it would make it easier and more efficient to copy the page and have the duplicate page open so users can start making adjustments and already be in the board builder view.