Add MDX section to Advance features

[molebox]

Describe the feature you'd like to request

We don't currently offer much in the way of MDX docs. There are now a number of different MDX solutions one could use with Next.js. We should document them.

Describe the solution you'd like

Add a new section to the Advanced features section which outlines how to use each of the MDX packages with Next.js

Describe alternatives you've considered

N/A

[balazsorban44]

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