Add missing space

Author: pomber

site/src/landing/description.js

@@ -23,7 +23,7 @@ export function Description() {
                 . Still very unstable, very undocumented,
                 very buggy, and not very fast. Codesandbox
                 examples coming soon for early adopters. 
-                Currently working on 
+                Currently working on{" "}
                 <a href="https://github.com/code-hike/react-tutorial-demo">
                   this demo
                 </a>.