Add MDX topic

topics/mdx/index.md

@@ -0,0 +1,9 @@
+aliases: mdx, mdx-js
+created_by: John Otander, Guillermo Rauch, James K. Nelson, Tim Neutkens, Brent Jackson, Jessica Stokes, and more.
+display_name: MDX
+github_url: https://github.com/mdx-js/mdx/
+logo: mdx.png
+released: Apr 15, 2019
+short_description: MDX allows you to use JSX in your markdown content. You can import components, such as interactive charts or alerts, and embed them within your content. This makes writing long-form content with components a blast.
+topic: mdx
+url: https://mdxjs.com/