Update README.md

README.md

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 <details>
 <summary markdown="span">Node-Red LXC</summary>
  
-<p align="center"><img src="https://avatars.githubusercontent.com/u/5375661?s=200&amp;v=4" alt="@node-red" width="100" height="100"/></p>
+<p align="center"><img src="https://nodered.org/about/resources/media/node-red-icon.png" alt="@node-red" width="100" height="100"/></p>
 
 <h1 align="center" id="heading"> Node-Red LXC Container </h1>