mod_rest/openapi: Improve organization and navigation Properties roughly sorted by documentation first. GET paths sorted by complexity. Spacing to help with navigation. Some XML stuff that should arguably be a separate commit, but whatever. Tags.

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labels:
- Statistics
summary: Collect statistics on user registration
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Description
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This module measures the rate at which users register on the server (through
providers like `mod_register_ibr` or `mod_register_web`).