DYI: Start complete subsection for docs

Miek Giebenrequested to merge
miek/@1741608189 into main

Anything that is too complex, are the UI is hard to get right, should link to this section, so we can properly document.

This starting page keeps and extends some wording that was removed from DYI a couple of days ago.

Fixes: https://gitlab.science.ru.nl/cncz/userdb-cli/-/issues/1004

Signed-off-by: Miek Gieben miek.gieben@ru.nl

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