doc: cross-compile for aarch64

Reverse-engineer d'un dockerfile pas à jour, mais ça fonctionne sur Debian 12 x86_64 à destination d'un RPi 4 Debian 11 aarch64.

added C-doc RN-silent labels

requested review from @HugoTrentesaux

approved this merge request

added 27 commits

• 2d134b5e...f36c72a6 - 26 commits from branch master
• 389998e8 - doc: cross-compile for aarch64

Compare with previous version

mentioned in commit 5fa3d533

merged