doc: nrf54h20: move sdfw/scfw section up

[greg-fer]

Edited the hierarchy of sections to move Programming the SDFW/SCFW section one level up.

[NordicBuilder]

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[FrancescoSer]

-1, this page needs bigger edits, also titles would not be aligned, will open a separate PR for that.

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[FrancescoSer]

Please refer to this: #18900

[greg-fer]

Reimplemented in #18900