[LyX/master] Remove hebrew letter document class

[Udicoudco]

On Tue, Jun 11, 2024 at 9:37 PM Udicoudco <udifoglle at gmail.com> wrote:
>
> How can it break old documents?
> Other than custom user layouts,
> which requires this one, I can't think
> of a problem.

And in such a rare case they can simply input
the regular letter layout instead (which gives
the correct alignment in the GUI anyway).
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