feat: import mo.scss manually

Author: wewoor

build/web/app.js

@@ -1,6 +1,7 @@
 import * as React from 'react';
 import * as ReactDOM from 'react-dom';
 import { Workbench, MoleculeProvider } from 'mo';
+import 'mo/style/mo.scss';
 
 const App = () => (
     <React.StrictMode>

stories/workbench/0-Workbench.stories.tsx

@@ -1,3 +1,4 @@
+import 'mo/style/mo.scss';
 import * as React from 'react';
 import { MoleculeProvider, Workbench } from 'mo/index';
 import { customExtensions } from '../extensions';