Enable teachers to archive courses

Closes issue #623 (closed) . Added a button to editions which enables teachers to archive the editions they manage. When pressed, it redirects the user to another warning page, informing them whether the edition has ended or not, asking them if they want to proceed. An archive edition button was also added to the finished editions from the home-page, to which the teacher has a manager role in.

src/main/java/nl/tudelft/queue/controller/EditionController.java

@@ -595,6 +595,35 @@ public class EditionController {
 		return "redirect:/edition/" + editionId;
 	}
 
+	/**
+	 * Gets the archive edition page to confirm that the teacher wants to archive the edition.
+	 *
+	 * @param  editionId The id of the edition to archive.
+	 * @return           The Thymeleaf template to resolve.
+	 */
+	@GetMapping("/edition/{editionId}/archive")
+	@PreAuthorize("@permissionService.canManageEdition(#editionId)")
+	public String getArchiveEdition(@PathVariable Long editionId,
+			Model model) {
+		EditionDetailsDTO edition = eCache.getRequired(editionId);
+		model.addAttribute("edition", edition);
+		return "edition/view/archive";
+	}
+
+	/**
+	 * Archives the edition
+	 *
+	 * @param  editionId The id of the edition to archive.
+	 * @return           A redirect back to the edition view page.
+	 */
+	@PostMapping("/edition/{editionId}/archive")
+	@PreAuthorize("@permissionService.canManageEdition(#editionId)")
+	public String archiveEdition(@PathVariable Long editionId) {
+		eApi.archiveEdition(editionId).block();
+
+		return "redirect:/edition/" + editionId;
+	}
+
 	/**
 	 * Gets the edition status page. This page is a status overview for the entire edition.
 	 *