Fix Showcase link in README

Updated the Showcase link to point to the new website.

Author: clementroche

README.md

@@ -8,7 +8,7 @@
 
 ## Introduction
 
-Lenis ("smooth" in latin) is a lightweight, robust, and performant smooth scroll library. It's designed by [@darkroom.engineering](https://twitter.com/darkroomdevs) to be simple to use and easy to integrate into your projects. It's built with performance in mind and is optimized for modern browsers. It's perfect for creating smooth scrolling experiences on your website such as WebGL scroll syncing, parallax effects, and much more, see [Demo](https://lenis.darkroom.engineering/) and [Showcase](#lenis-in-use).
+Lenis ("smooth" in latin) is a lightweight, robust, and performant smooth scroll library. It's designed by [@darkroom.engineering](https://twitter.com/darkroomdevs) to be simple to use and easy to integrate into your projects. It's built with performance in mind and is optimized for modern browsers. It's perfect for creating smooth scrolling experiences on your website such as WebGL scroll syncing, parallax effects, and much more, see [Demo](https://lenis.darkroom.engineering/) and [Showcase](https://www.lenis.dev/showcase).
 
 Read our [Manifesto](https://github.com/darkroomengineering/lenis/blob/main/MANIFESTO.md) to learn more about the inspiration behind Lenis.