[no ci] fix logo link in README

Author: ytdHuang

README.md

@@ -1,6 +1,6 @@
 <!-- Logo -->
 <div align="center">
-  <img src="./docs/src/public/logo.png" alt="QuantumToolbox.jl logo" width="150">
+  <img src="./docs/src/assets/logo.png" alt="QuantumToolbox.jl logo" width="150">
 </div>
 
 # QuantumToolbox.jl