Revert "feat: enable rehype-raw plugin by default (#2199)"

[SoonIter]

This reverts commit fb2ff04.

Summary

```js title="test.js"
console.log('Hello CodeBlock!');
```

title does not work after adding rehype-raw

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[JounQin]

It seems working on v1 but indeed not working on v2

v1:

v2:

I'll try to investigate soon later.

[SoonIter]

revert it first

maybe conflicted with shiki, title meta should be consumed by shiki