docs(external docs): internal schema beta highlight article

[JeanMertz]

trafficstars

closes #11361

👀 rendered

I should note that I forgot that @barieom already started an initial highlight article draft in #10528. That one is outdated, but we can easily update it if needed. I'm open to using either of the two highlight articles, or merging them if there's merit to both of them. I'll leave that up to @barieom to decide.

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