remove unused app controller and service

src/app.module.ts

@@ -1,8 +1,6 @@
 import { Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { MongooseModule } from '@nestjs/mongoose';
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
 import Configuration from './config/configuration';
 
 @Module({
@@ -23,7 +21,7 @@ import Configuration from './config/configuration';
       }),
     }),
   ],
-  controllers: [AppController],
-  providers: [AppService],
+  controllers: [],
+  providers: [],
 })
 export class AppModule {}