chore: Move editor into codebase (#2930)

shared/editor/embeds/Codepen.tsx

@@ -0,0 +1,14 @@
+import * as React from "react";
+import Frame from "./components/Frame";
+import { EmbedProps as Props } from ".";
+
+const URL_REGEX = new RegExp("^https://codepen.io/(.*?)/(pen|embed)/(.*)$");
+
+export default class Codepen extends React.Component<Props> {
+  static ENABLED = [URL_REGEX];
+
+  render() {
+    const normalizedUrl = this.props.attrs.href.replace(/\/pen\//, "/embed/");
+    return <Frame {...this.props} src={normalizedUrl} title="Codepen Embed" />;
+  }
+}