Template for docs pages

Summary:
- Dynamic loading of documentation pages
- code highlighting for markdown files
- editing playground from sidebar

Reviewed By: emilsjolander

Differential Revision: D6964951

fbshipit-source-id: 1c7f36afa8d23215471d5b9a9c01bd2241c2008e

website/src/templates/withoutPlayground.js

@@ -13,11 +13,16 @@
 import React from 'react';
 import Page from '../components/Page';
 import Padded from '../components/Padded';
+import {Icon} from 'antd';
+import Link from 'gatsby-link';
 
 export default ({pathContext}) => {
   return (
-    <Page>
+    <Page withSpacing>
       <Padded>
+        <Link to="/docs">
+          <Icon type="left-circle-o" /> back to overview
+        </Link>
         <div dangerouslySetInnerHTML={{__html: pathContext.html}} />
       </Padded>
     </Page>