Better Docusaurus Support

[frencojobs]

This PR does -

• [x] Allow not only one preset but all presets with supported plugins such as @docusaurus/content-docs
• [x] Outdate the requirement of MDXComponents override
• [x] Close #41
• [x] Add docusaurus's default copy-to-clipboard button which is better in a11y and i18n support
• [x] Include default twoslash CSS which is override-able
• [x] Support title argument in the code fence as default preset does
• [x] Close #50
• [x] Discard errors, queries, completions when copying to clipboard, also don't discard new lines

[orta]

Structurally seems sound to me 👍🏻

[frencojobs]

Hi @orta, can you review this please. I've added a default CSS based on your CSS but modified it to use the CSS variables from docusaurus. I've added examples in the examples/docusaurus, you can see the results there.

I've also made it so that the fence parser will parse the title and pass it through the meta and render with a div.code-title tag. For convenience, the pre tag will have a class .with-title whenever there's a title in the code block. But I've made them optional and to show up if and only if there's the title in the fence so all the tests should just pass OK. It won't affect any existing stuffs.

This makes the user require nothing but a preset and lets them have a much nicer out-of-the-box experience. No overriding or CSS should be required to make it work.

We might have to update the documentations before deploy though, but I'm afraid you'll be better at that. Take your time. Byee.

[frencojobs]

This is out of scope for this PR but added a fix to #50 since it was on the way.

[frencojobs]

~Found a bug!~ Fixed.

[orta]

Will give a last read and deploy after a walk