Update link

Author: eldruin

README.md

@@ -5,7 +5,7 @@
 The embedded showcase is a [gallery] of open source embedded applications built
 by the Rust community.
 
-[gallery]: https://rust-embedded.github.io/showcase/
+[gallery]: https://showcase.rust-embedded.org/
 
 This project is developed and maintained by the [Resources team][team].