fix: switch the reactivity/proxies CodePen to the Vue account (#919)

Author: skirtles-code

src/guide/reactivity.md

@@ -44,7 +44,7 @@ So how would we do this in JavaScript?
 When you pass a plain JavaScript object to an application or component instance as its `data` option, Vue will walk through all of its properties and convert them to [Proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) using a handler with getters and setters. This is an ES6-only feature, but we offer a version of Vue 3 that uses the older `Object.defineProperty` to support IE browsers. Both have the same surface API, but the Proxy version is slimmer and offers improved performance.
 
 <div class="reactivecontent">
-  <common-codepen-snippet title="Proxies and Vue's Reactivity Explained Visually" slug="zYYzjBg" tab="result" theme="light" :height="500" :team="false" user="sdras" name="Sarah Drasner" :editable="false" :preview="false" />
+  <common-codepen-snippet title="Proxies and Vue's Reactivity Explained Visually" slug="VwmxZXJ" tab="result" theme="light" :height="500" :editable="false" :preview="false" />
 </div>
 
 That was rather quick and requires some knowledge of [Proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) to understand! So let’s dive in a bit. There’s a lot of literature on Proxies, but what you really need to know is that a **Proxy is an object that encases another object or function and allows you to intercept it.**