add docs for staged configs phase 2

[vivki]

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[mjang]

@vivki Thanks for the draft. I see (at least most) of what you're doing for import/export with the following "flag": "staged-configs-phase-2"

I presume that feature flag still blocks what's shown in the API docs. (You can see for yourself. Take your repo, and follow the steps in https://github.com/nginx/documentation/blob/main/CONTRIBUTING_DOCS.md. Run the make watch command, and you'll have a local build in localhost:1313.

[mjang]

Updates work for me, thanks @vivki ! I'll post in the internal nginx-docs-reviews channel for a 2nd approval.

[mjang]

@vivki , I propose that we supersede this PR with #553 (I've included your one.json there). It allows us to test some of the X-links from the main doc to the API reference.