新增 yudao-spring-boot-starter-banner 组件，用于项目启动时打印开发文档、接口文档等

yudao-gateway/src/main/java/cn/iocoder/yudao/gateway/GatewayServerApplication.java

@@ -9,14 +9,8 @@ import org.springframework.core.env.Environment;
 public class GatewayServerApplication {
 
     public static void main(String[] args) {
-//        SpringApplication.run(GatewayServerApplication.class, args);
-
         // 启动 Spring Boot 应用
-        ConfigurableApplicationContext context = SpringApplication.run(GatewayServerApplication.class, args);
-
-        // 查看 Environment
-        Environment environment = context.getEnvironment();
-        System.out.println(environment);
+        SpringApplication.run(GatewayServerApplication.class, args);
     }
 
 }