Add comments for devs

[MAILPOET-2450]

assets/js/src/form_editor/components/editor.jsx

@@ -6,6 +6,13 @@ import Sidebar from './sidebar.jsx';
 import FormTitle from './form_title.jsx';
 import Notices from './notices.jsx';
 
+/**
+ * This component renders the form editor app.
+ * Class names and organization of elements are done based on Gutenberg's edit-post package.
+ * (https://github.com/WordPress/gutenberg/tree/master/packages/edit-post).
+ * The goal is to render the same DOM for layout as Gutenberg post/page editor
+ * so that we can reuse it's CSS.
+ */
 export default () => {
   const sidebarOpened = useSelect(
     (select) => select('mailpoet-form-editor').getSidebarOpened(),

assets/js/src/form_editor/store/store.jsx

@@ -1,3 +1,7 @@
+/**
+ * The store is implemented using @wordpress/data module
+ * @see https://developer.wordpress.org/block-editor/packages/packages-data/
+ */
 import { registerStore } from '@wordpress/data';
 import * as actions from './actions.jsx';
 import createReducer from './reducer.jsx';