update README.md

README.md

@@ -25,7 +25,7 @@
   </p>
 
   <p align="center">
-      <img width="800" src="https://jsonvisio.com/jsonvisio-screenshot.webp" alt="preview 1" />
+      <img width="800" src="/public/jsonvisio-screenshot.webp" alt="preview 1" />
   </p>