Add Markdown Renderer

[rjwignar]

ChatCraft render previews of Mermaid and Nomnoml. However, I noticed we don't render Markdown: https://github.com/tarasglek/chatcraft.org/blob/7cc1e2f3ec1aaf77014a56703d7d8e77c706f72d/src/components/Markdown.tsx#L98-L117

Is this a feature we would like to see?

[mingming-ma]

I think currently the ReactMarkdown from react-markdown control the whole render result, it might be very difficult to change the lib but there are tons of plugins to adjust the render results I believe

[tarasglek]

yeah it's frustrating that we dont support nested markdown code blocks