feat: minify HTML output

[IGassmann]

This minifies the resulting HTML with rehype-preset-minify. Without it, the HTML output of MDX content is un-minified which results in larger payloads.

Motivation

I'm currently trying to migrate my personal website to MDXTS. My website has a RSS JSON Feed that is generated with the help of cheerio. The un-minified content would cause the JSON feed to have undesirable \n characters that mess up the HTML rendering in RSS readers..

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[souporserious]

Thank you for the PR! I understand the concern for the final output, but I don't want to add this package right now since rehype-preset-minify has 24 additional dependencies and I've been trying to keep the overall dependencies in this library stable since they are already quite large.

I've been thinking about exposing a way to override remark and rehype plugins which would allow you to pass this particular plugin yourself. However, allowing arbitrary plugins could break existing MDXTS functionality so I've been cautious about exposing that ability. If you can make use of the MDXContent component that does allow you to pass custom plugins.