fix(repository): Move backend code into subdirectory

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

backend/src/events.ts

@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const eventModuleConfig = {
+  wildcard: false,
+  delimiter: '.',
+  newListener: false,
+  removeListener: false,
+  maxListeners: 10,
+  verboseMemoryLeak: true,
+  ignoreErrors: false,
+};
+
+export enum NoteEvent {
+  PERMISSION_CHANGE = 'note.permission_change' /** noteId: The id of the [@link Note], which permissions are changed. **/,
+  DELETION = 'note.deletion' /** noteId: The id of the [@link Note], which is being deleted. **/,
+}