支持渲染HTML Support for rendering HTML

[rong6]

In the rendering custom html section of https://www.usememos.com/docs/getting-started/content-syntax, we can use

\```__html
<hr />
\```

to do the rendering html. but this only works on the web page, I want the app to recognize the tag and do theRendering.

[Issues-translate-bot]

Issue is not in English. It has been translated automatically.

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Title: Support for rendering HTML