make missing driver error more obvious in the CLI

[juliezzhou]

Proposal

Make missing driver error message more obvious

• move it down to the deployment section
• change the text color to red

Use-cases

For first time users, the current message "Contraint missing driver" is easily missed.

[airtonix]

It should say Docker.

Not everyone is at intimate with the code base as you are.

In fact everyone will assume that since you call them drivers, that there is more than one.

It won't matter if you change it to singular "driver", because people will still assume more than one.