chore: 🤖 update url

Author: mjancarik

README.md

@@ -1,6 +1,6 @@
 <p align="center">
   <a href="https://merkur.js.org/docs/getting-started" title="Getting started">
-    <img src="https://raw.githubusercontent.com/mjancarik/merkur/master/images/merkur-illustration.png" width="100px" height="100px" alt="Merkur illustration"/>
+    <img src="https://raw.githubusercontent.com/mjancarik/merkur/master/images/merkur-logo.png" width="100px" height="100px" alt="Merkur illustration"/>
   </a>
 </p>