* Run through the macOS update instructions one more time. I think
they're in a pretty good state now since this is the first attempt to
rerun them since we dropped Vagrant.
* Removed Parallels references for arm64.
* Removed references to removing Vagrant because it's no longer on any
of the hosts.
* Update macOS to 14.5.
* Update XCode CLT to 14.3.
macOS 14.2.1 on amd64, 14.3 on arm64
XCode Console Tools 15.1
Other changes:
macOS install is done from the installers rather than from the recovery partition
readme.md is now written for a vcpkg-team audience
vagrant is removed as a dependency so that discussion of how to persist the VMs between machines could be included
arm64 is added using https://github.com/s-u/macosvm