Add @nestjs/serve-static dependency and update file paths for banner uploads; remove unused form utility files

src/app.module.ts

@@ -31,7 +31,6 @@ import { AlumnosModule } from './alumnos/alumnos.module';
 @Module({
   imports: [
     ConfigModule.forRoot({ isGlobal: true }),
-
     TypeOrmModule.forRootAsync({
       imports: [ConfigModule],
       useFactory: createMainDbConfig,