Add archive button for editions

Currently, there are 'Finished' and 'Archived' courses on the home page for teachers, but there is no way in Queue to archive a course.

• An archive button should be added to the edition and home page (on the home page, only show for finished edition)
• On click, it should display a warning, that this should only be done after the edition is completely finalised (including resits)
• On confirm, the edition is archived
• Only teachers can archive an edition