re-add conclusion

Author: jkarni

doc/tutorial/Server.lhs

@@ -1108,6 +1108,8 @@ $ curl http://localhost:8081/b
 "hi"
 ```
 
+## Conclusion
+
 You're now equipped to write webservices/web-applications using
 **servant**. The rest of this document focuses on **servant-client**,
 **servant-js** and **servant-docs**.