Import styles to create component mapper demo

Author: rvsia

packages/react-renderer-demo/src/app/src/doc-components/component-mapper/form-fields-mapper.js

@@ -1,6 +1,8 @@
-import React, { Fragment, useEffect } from 'react';
+import React, { Fragment } from 'react';
 import FormRender, { layoutComponents, componentTypes } from '@data-driven-forms/react-form-renderer';
 
+import './form-fields-mapper-docs.css';
+
 const wrapperStyles = {
   padding: 16,
   borderRadius: 4,