Proper cdn for React Markdown Previewer

Tell us what’s happening:
Hi all, I am attempting to begin the React Markdown Previewer project, and am having trouble importing the proper items to be able to utilize Markdown. I have a basic layout of a React app rendering to the page, but am not sure of where to read up on incorporating Markdown into my code. Any resources, or direction to head in for some information, is much appreciated. Thanks in advance!

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36.

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