rename core-* nixosConfigs to be building specific #1008
Description
Description
Follow up to: #996
Previous efforts to unify the hostname and paths with their nix attribute paths has left us using core-master and core-slave to identify the 2 machines in scale-network.
This should instead refer to the their location within the conference so its clear which ones being modified.
AC
- nixosConfigurations.{core-*} should be renamed to core-expo and core-conf respectively
- Update any other references where this has been set