chore: Upgrade website styles.

Author: jaywcjlove

README.md

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 react-codemirror
 ===
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 CodeMirror component for React. demo @[uiwjs.github.io/react-codemirror/](https://uiwjs.github.io/react-codemirror/)
 
 <a href="https://uiwjs.github.io/react-codemirror/"><img src="https://raw.githubusercontent.com/uiwjs/react-codemirror/master/react-codemirror.png" /></a>
 
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 **Features:**
 
 🌱 Automatically load `mode` files based on configuration.