Support a markdown parser other than markdown-it. maybe rehype?

[olets]

Is your feature request related to a problem? Please describe.

Reasons I think it'd be nice to support a markdown parser other than markdown-it:

• Configuring markdown-it isn't always user-friendly or contributor-friendly. See for example Syntax highlighting and remove <pre> tag markdown-it/markdown-it#269.
• Some of its specific defaults can make some Shiki configurations tricking. See for example using a transformer to add a wrapping element results in extra duplicative nodes shikijs/shiki#811.

Describe the solution you'd like

Reasons remark-rehype could be a good alternative:

• Shiki's rehype plugin is more feature-rich than its markdown-it plugin. Compare https://shiki.style/packages/rehype to https://shiki.style/packages/markdown-it
• Rehype has good plugin developer documentation (markdown-it has very little). See for example Remark vs MarkdownIt benrbray/noteworthy#16

Describe alternatives you've considered

No response

Additional context

Could be a cool v2 addition.

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.

[brc-dd]

We tried integrating remark/rehype but it doesn't work with Vue. They have made some very opinionated implementations and multiple times over the past have refused to support any customization. The only way to support it is patch many packages of unified ecosystem. But they have high changing frequency and it's hard to maintain a patch. See these patches for example:

https://github.com/antfu/parse5-case-sensitive
https://github.com/antfu/hastscript-case-sensitive
https://github.com/antfu/remark-xhtml
https://github.com/antfu/rehype-vue-sfc

[olets]

Good to know, thanks