Declarative settings documentation

[andrey18106]

Declarative settings docs for https://github.com/nextcloud/server/pull/42661.

🖼️ Screenshots

[andrey18106]

Please make https://docs.nextcloud.com/server/latest/developer_manual/digging_deeper/settings.html a directory (the old page becomes the index) and add yours as new sub page. Then we have both settings docs in one combined place 🙏

Do you mean to include it in Settings article like that?

[ChristophWurst]

That is fine too :)

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