Support `dart` lang on code block mdx

[softmarshmallow]

https://www.grida.co/docs/@designto-code/figma-autolayout

dart lang syntax highlight currently not working

[You-J]

The prism-react-renderer used did not support dart, so I changed it to react-syntax-highlighter used in the rendering page.

[softmarshmallow]

rendering page?

[You-J]

I mean the one on the right in this section.

[softmarshmallow]

@You-J Close this if resolved - with PR link