Add MDNEXT to projects page (#1309)

MDNEXT is an ecosystem of tools and templates surrounding the MDX + NextJS ecosystem. It includes a growing component library, a handful of templates, and a CLI for choosing one!

Author: domitriusclark

docs/projects.mdx

@@ -15,6 +15,7 @@
   Spectacle
 - [Charge][]: An opinionated, zero-config static site generator
 
+
 ## Sites
 
 - [Vercel Docs][vercel-docs]
@@ -43,3 +44,4 @@
 [spectacle-boilerplate-mdx]: https://github.com/FormidableLabs/spectacle-boilerplate-mdx
 [charge]: https://charge.js.org
 [mdx-fairy-tale]: https://github.com/DeveloperMode/mdx-fairy-tale
+[MDNEXT]: https://github.com/domitriusclark/mdnext