feature: Describe use of XC-based RBAC

[mjang]

Proposed changes

Problem: Describe existing XC features usable for RBAC for NGINX One Console

Solution: Organize content as drafted by PM

Note how this PR organizes the drafted content, under "Role-based access control"

When you review the "build" review the content in the ToC, under "Role-based access control".

Closes #209

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Footnotes

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[github-actions]

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[mjang]

cc @kamalchaturvedi

[ADubhlaoich]

LGTM in a general sense, though I find prefixing document type to page title really heavy-handed and will fight any introduction to a product I'm responsible for.

[jasonclopper]

Nit picky, but at least in the preview image the capitalization after the doc type is inconsistent.

[ADubhlaoich]

A bunch of edit suggestions, including the excision of the type prefixes. Renamed one title with respect to the context of the section: I had to delete a thread I started earlier to be able to highlight the full block.

[mjang]

Nit picky, but at least in the preview image the capitalization after the doc type is inconsistent.

Noted and updated per other comments

[mjang]

As not all reviewers have approval privileges, I'm merging, based on approval comments.