Re-read the Orca spec: 'orca nodes' lists already-joined hosts and
'orca join' attaches an existing node to a cluster, but Orca does not
provision the VMs themselves. VM provisioning (SysEleven OpenStack
via Terraform) is a separate concern and will land in a dedicated repo
under the M1.2 milestone, not in orca-platform.
Removes vms/{vm-edge,vm-control,vm-data,stage}.toml + vms/README.md.
Updates README directory tree and milestone fill-in table to reflect
that M1.2's VM specs live elsewhere. validate.sh stops checking vms/.
Refs: M1.1
sharang
3d7b67060e