Update image source to use new direct URL from the dev portal (#224)

docs: update image source in README.md to use new direct URL from the dev portal

Author: xavi160

docs/README.md

@@ -16,7 +16,7 @@ Norigin Spatial Navigation is an open-source library that handles directional fo
 ---
 
 <div align="center">
-  <img src="https://raw.githubusercontent.com/NoriginMedia/Norigin-Spatial-Navigation/main/readme-assets/norigin-spatial-navigation/norigin-spatial-navigation.webp" alt="Spatial Navigation" style={{ borderRadius: 30 }} />
+  <img src="https://devportal.noriginmedia.com/img/navigation.webp" alt="Norigin Spatial Navigation" style={{ borderRadius: 30 }} />
 </div>
 
 ## Supported platforms