docs(templates): document the ordo booklet's required two-pass build

A LaTeX table of contents needs two pdflatex passes -- the first pass
leaves every entry showing '??', the second resolves the \pageref
values. A user hit exactly this and reported it as a bug; the template
was fine, the instructions were not.

README's rendering example now runs pdflatex twice for ordo.tex (or
names latexmk -pdf as the one-shot alternative) and notes the wall
calendar needs only one pass, having no cross-references of its own.

make check-templates now runs pdflatex twice per LaTeX template too,
so the target exercises what a user actually has to do rather than
silently passing on a single, incomplete pass.

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