Update README.md

Author: ashvayka

README.md

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 # Thingsboard IoT Gateway
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 The Thingsboard **IoT Gateway** is an open-source solution that allows you to integrate devices connected to legacy and third-party systems with Thingsboard.
 
 Thingsboard is an open-source IoT platform for data collection, processing, visualization, and device management. See [**What is Thingsboard?**](https://thingsboard.io/docs/getting-started-guides/what-is-thingsboard/) if you are new platform user. 
 
-## Documentation
+![IoT Gateway architecture](./img/tb-gateway.png?raw=true "IoT Gateway architecture")
+
+### Documentation
 
 Thingsboard IoT Gateway documentation is hosted on [thingsboard.io](https://thingsboard.io/docs/iot-gateway/).
 
@@ -22,8 +23,6 @@ Thingsboard IoT Gateway provides following features:
 
 ### Architecture  
 
-![IoT Gateway architecture](./img/tb-gateway.png?raw=true "IoT Gateway architecture")
-
 The IoT Gateway is built on top of **Java**, however is different from similar projects that leverage OSGi technology.
 The idea is distantly similar to microservices architecture.
 There are **other programming languages** (C, C++, Python, Javascript, Go..) that may be more suitable for application development that target IoT devices.