Right now, you can archive a map by entering into it's configuration page, and scrolling down, then hitting the Archive button.  Or, from the maps page, clicking on the 3 buttons and hitting archive.  I propose simply adding a right-click context option for it.    I would also love the ability to archive an entire folder (and to be able to restore the directory as a whole as well).  There are several folders for maps I've used for specific adventures that are unlikely to be re-visited by this particular party, and archiving the whole folder instead of individual maps would be far more convenient.