website: update example preview.

Author: jaywcjlove

website/src/pages/doc/index.tsx

@@ -1,7 +1,6 @@
 import data from 'react-code-preview-layout/README.md';
 import CodeLayout from 'react-code-preview-layout';
 import MarkdownPreview from '@uiw/react-markdown-preview';
-import { getCodeString } from 'rehype-rewrite';
 import { getMetaId, isMeta, getURLParameters } from 'markdown-react-code-preview-loader';
 
 const Doc = () => (
@@ -18,7 +17,7 @@ const Doc = () => (
         const metaId = getMetaId(meta) || String(line);
         const Child = data.components[`${metaId}`];
         if (metaId && typeof Child === 'function') {
-          const code = getCodeString(node.children);
+          const code = data.data[metaId].value || '';
           const param = getURLParameters(meta);
           return (
             <CodeLayout toolbar={param.title || '示例展示'} code={<code {...rest} />} text={code}>