Add React Native banner to README (#225)

Enhance README.md with responsive image support for React Native (#225)

Author: xavi160

README.md

@@ -15,9 +15,15 @@ The missing piece between your app and the TV remote.
 - **Light and low-dependency**: Simple API, minimal footprint, no runtime surprises
   on constrained TV hardware.
 
+<a href="https://github.com/NoriginMedia/Norigin-Spatial-Navigation/blob/next/docs/guides/react-native-tv.md">
 <div align="center">
-  <img src="/readme-assets/norigin-spatial-navigation/norigin-spatial-navigation.gif" alt="Norigin Spatial Navigation" />
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://devportal.noriginmedia.com/img/RN-dark.png">
+    <source media="(prefers-color-scheme: light)" srcset="https://devportal.noriginmedia.com/img/RN-light.png">
+    <img alt="Norigin Spatial Navigation now supports React Native" src="https://devportal.noriginmedia.com/img/RN-light.png">
+  </picture>
 </div>
+</a>
 
 ## [Documentation](https://devportal.noriginmedia.com/docs/Norigin-Spatial-Navigation/)