Remove architecture picture in README

Author: duhengforever

README.md

@@ -5,8 +5,6 @@
 ### A vendor-neutral open standard for distributed messaging and streaming
 OpenMessaging, which includes the establishment of industry guidelines and messaging, streaming specifications to provide a common framework for finance, e-commerce, IoT and big-data area. The design principles are the cloud-oriented, simplicity, flexibility, and language independent in distributed heterogeneous environments. Conformance to these specifications will make it possible to develop a heterogeneous messaging applications across all major platforms and operating systems.
 
-## The domain architecture
-![domain-design](assets/images/OpenMessaging-V0.3.0-alpha.png)
 
 ## Doc
 [API Doc](https://openmessaging.github.io/openmessaging-java/).