Kris/persona flow 170 (#176)

* added markdown components and remark libraries

* added Markdown to message-item

* removed babelrc, updated api localhost endpoint, removed api key header

* added ReactMarkdown and remarkGfn to handle tables

* cleanup MessageItem, remove unused dependencies

* added tailwindcss/typography to style streamed content;

* added remark-math

* removed unused components

* removed unused plugins