fix link to zoxide demo

Author: ibraheemdev

README.md

@@ -248,6 +248,6 @@
  </h1>
  <p align="center">A smarter <code>cd</code> command.</p>
  <p align="center">
- <img src="https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/demo.gif" width="600" />
+ <img src="https://raw.githubusercontent.com/ajeetdsouza/zoxide/main/contrib/tutorial.webp" width="600" />
  </p>
 </p>