Fix fresh build & linting

[barrymcgee]

Done

• Add preserve script so fresh npm run serve will run correctly
• Tidy up linting errors

• Pull down code
• Run npm run clean
• Run npm run serve - verify Storybook fires up without error
• Run npm run lint - no errors or warnings

[webteam-app]

No ./run found. Unable to start demo.

[Caleb-Ellis]

LGTM :+1:

QA

• ran yarn clean, yarn preserve and yarn serve
• verified Storybook runs with no errors
• ran yarn lint and verified there were no linting errors or warnings
• verified linter picks up errors by making small syntax changes and running yarn lint