Bring `libvirt-ci` front and centre when discussing dependencies for
QEMU. While we are at it:
- drop links to additional instructions (libvirt is more upto date)
- compress pkg installs into a table
- call out distro/upstream dep difference in a proper note
Message-ID: <20251204194902.1340008-9-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>