Provide Markdown support for text cards

kosterhout

Currently, the text editing features are very limited. While a rich text editor would be appreciated, simple Markdown support would allow for easy, in-line styling without the need for a rich text editor bar. 

 

I know this will be enacted when a user can use basic Markdown syntax to stylize text within the text card in the New UX pages. Please see the Markdown basic syntax guide for more information: https://www.markdownguide.org/basic-syntax/