fix(repository): Move backend code into subdirectory

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

backend/src/logger/logger.module.ts

@@ -0,0 +1,15 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { Module } from '@nestjs/common';
+
+import { ConsoleLoggerService } from './console-logger.service';
+import { TypeormLoggerService } from './typeorm-logger.service';
+
+@Module({
+  providers: [ConsoleLoggerService, TypeormLoggerService],
+  exports: [ConsoleLoggerService, TypeormLoggerService],
+})
+export class LoggerModule {}