chore(docs): update example link

README.md

@@ -69,7 +69,7 @@
 
 ## Demo
 
-You can play with `fireworks-js` at [fireworks.js.org](https://fireworks.js.org) or [codesandbox.io](https://codesandbox.io/s/fireworks-js-react-bjeoqy?file=/src/App.tsx)
+You can play with `fireworks-js` at [fireworks.js.org](https://fireworks.js.org) or [stackblitz.com](https://stackblitz.com/edit/fireworks-js-react?file=src%2FApp.tsx)
 
 ## Installation
 
@@ -125,16 +125,12 @@ const fireworks = new Fireworks(container, { /* options */ })
 fireworks.start()
 ```
 
-[![Edit @fireworks-js/react](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/p/sandbox/blissful-sanderson-dkvnx4)
-
 #### [`@fireworks-js/react`](https://github.com/crashmax-dev/fireworks-js/tree/master/examples/with-react)
 
 ```sh
 npm install @fireworks-js/react
 ```
 
-[![Edit @fireworks-js/react](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/fireworks-js-react-bjeoqy?fontsize=14&hidenavigation=1&theme=dark)
-
 #### [`@fireworks-js/preact`](https://github.com/crashmax-dev/fireworks-js/tree/master/examples/with-preact)
 
 ```sh