fix links to the demo and the docs (#3148)

README.md

@@ -12,7 +12,7 @@ A small, fast and scalable bearbones state-management solution using simplified
 
 Don't disregard it because it's cute. It has quite the claws, lots of time was spent dealing with common pitfalls, like the dreaded [zombie child problem](https://react-redux.js.org/api/hooks#stale-props-and-zombie-children), [react concurrency](https://github.com/bvaughn/rfcs/blob/useMutableSource/text/0000-use-mutable-source.md), and [context loss](https://github.com/facebook/react/issues/13332) between mixed renderers. It may be the one state-manager in the React space that gets all of these right.
 
-You can try a live demo [here](https://githubbox.com/pmndrs/zustand/tree/main/examples/demo).
+You can try a live [demo](https://zustand-demo.pmnd.rs/) and read the [docs](https://zustand.docs.pmnd.rs/).
 
 ```bash
 npm install zustand
@@ -505,4 +505,4 @@ Some users may want to extend Zustand's feature set which can be done using thir
 
 ## Comparison with other libraries
 
-- [Difference between zustand and other state management libraries for React](https://docs.pmnd.rs/zustand/getting-started/comparison)
+- [Difference between zustand and other state management libraries for React](https://zustand.docs.pmnd.rs/getting-started/comparison)

examples/demo/src/components/Details.jsx

@@ -2,7 +2,7 @@ export default function Details() {
   return (
     <>
       <nav className="nav">
-        <a href="https://docs.pmnd.rs/zustand">Documentation</a>
+        <a href="https://zustand.docs.pmnd.rs/">Documentation</a>
         <a href="https://github.com/pmndrs/zustand">Github</a>
       </nav>
       <div className="bottom">