Check for interrupts in prompter. Exit immediately if interrupt detected

[kylehodgetts]

This PR checks for interrupts in the wizard. If the user presses ctrl-c at any point, the wizard exits immediately.

resolves #158

Changes

• check for promptui.ErrInterrupt when running any prompter

Fixes

• issue where wizard flow would continue to the next question if ctrl-c was pressed

Checklist

• [x] tested locally
• [ ] added new dependencies
• [ ] updated the docs
• [ ] added a test