fix: error boundary handling can now be handled by Plugin component

Author: jsnwesson

example-plugin-app/src/PluginOne.jsx

@@ -1,13 +1,14 @@
 import React from 'react';
 import { Plugin } from '@edx/frontend-platform/plugins';
 
+function Greeting({subject}) {
+  return <div>Hello {subject.toUpperCase()}</div>
+}
+
 export default function PluginOne() {
   return (
-    <Plugin className="bg-light" ready>
-      <section className="bg-light p-3">
-        <h2>Site Maintenance</h2>
-        <p>The site will be going down for maintenance soon.</p>
-      </section>
+    <Plugin className="bg-light">
+      <Greeting />
     </Plugin>
   );
 }