fix(repository): Move backend code into subdirectory

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

backend/src/notes/alias.dto.ts

@@ -0,0 +1,32 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { ApiProperty } from '@nestjs/swagger';
+import { IsBoolean, IsString } from 'class-validator';
+
+import { BaseDto } from '../utils/base.dto.';
+
+export class AliasDto extends BaseDto {
+  /**
+   * The name of the alias
+   */
+  @IsString()
+  @ApiProperty()
+  name: string;
+
+  /**
+   * Is the alias the primary alias or not
+   */
+  @IsBoolean()
+  @ApiProperty()
+  primaryAlias: boolean;
+
+  /**
+   * The public id of the note the alias is associated with
+   */
+  @IsString()
+  @ApiProperty()
+  noteId: string;
+}