adding bookmarklet

src/outputs/embeddable-widget.js

@@ -0,0 +1,40 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import Widget from '../components/widget';
+
+export default class EmbeddableWidget {
+  static el;
+
+  static mount() {
+    const component = <Widget />;
+
+    function doRender() {
+      if (EmbeddableWidget.el) {
+        throw new Error('EmbeddableWidget is already mounted, unmount first');
+      }
+      const el = document.createElement('div');
+      document.body.appendChild(el);
+      ReactDOM.render(
+        component,
+        el,
+      );
+      EmbeddableWidget.el = el;
+    }
+    if (document.readyState === 'complete') {
+      doRender();
+    } else {
+      window.addEventListener('load', () => {
+        doRender();
+      });
+    }
+  }
+
+  static unmount() {
+    if (!EmbeddableWidget.el) {
+      throw new Error('EmbeddableWidget is not mounted, mount first');
+    }
+    ReactDOM.unmountComponentAtNode(EmbeddableWidget.el);
+    EmbeddableWidget.el.parentNode.removeChild(EmbeddableWidget.el);
+    EmbeddableWidget.el = null;
+  }
+}