Fix Cardano logo in Used by section

Author: portdeveloper

README.md

@@ -25,7 +25,7 @@ Shipping in production on documentation sites across the ecosystem:
   <a href="https://docs.kaia.io" title="Kaia"><img src="https://github.com/kaiachain.png" width="56" height="56" alt="Kaia"/></a>
   <a href="https://docs.nillion.com" title="Nillion"><img src="https://github.com/NillionNetwork.png" width="56" height="56" alt="Nillion"/></a>
   <a href="https://docs.chroniclelabs.org" title="Chronicle"><img src="https://github.com/chronicleprotocol.png" width="56" height="56" alt="Chronicle"/></a>
-  <a href="https://docs.cardano.org" title="Cardano"><img src="https://github.com/input-output-hk.png" width="56" height="56" alt="Cardano"/></a>
+  <a href="https://docs.cardano.org" title="Cardano"><img src="https://github.com/cardano-foundation.png" width="56" height="56" alt="Cardano"/></a>
   <a href="https://docs.arbitrum.io" title="Arbitrum"><img src="https://github.com/OffchainLabs.png" width="56" height="56" alt="Arbitrum"/></a>
 </p>