Update README.md

README.md

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 </details>
 
 <details>
-<summary markdown="span"> 🔸openHAB LXC</summary>
+<summary markdown="span"> openHAB LXC</summary>
  
 <p align="center"><img src="https://www.openhab.org/openhab-logo-square.png?raw=true" height="100"/></p>