Feat: Update Markdown with Vercel's new drop-in replacements.

[genmnz]

A drop-in replacement for react-markdown, designed for AI-powered streaming.
https://github.com/vercel/streamdown
streamdown.ai/
This will definitely clean up a lot of code and maintenance

[prashantbhudwal]

@zaidmukaddam are you considering this? Let me know if you want me to hack on this!