script:deploy test flows

[RubenHalman]

🚀 Using Demo Flows for Org Deployment

This change allows us to retire the separate demo-flows repository, as all flows used as examples are now co-located within this project, together with flows provided for tests.

📦 Deploying Test Flows to Any Org

A CLI-based utility is provided to simplify deploying flows directly:

npm run deploy:testflows -- --target-org my-sandbox

Or by setting an environment variable:

SF_TARGET_ORG=my-sandbox npm run deploy:testflows

NOTE:

1. The sfdx folder is excluded from Prettier by introducing a new .prettierignore
2. NPM Run prepush does not exist within the repo and has been removed from .husky hooks