use turborepo for monorepo

[koshuang]

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[koshuang]

next-starter:dev: ERROR We did not detect an in-use package manager for your project. Please set the "packageManager" property in your root package.json (https://nodejs.org/api/packages.html#packagemanager) or run npx @turbo/codemod add-package-manager in the root of your monorepo.
next-starter:dev: error Command failed with exit code 1.
next-starter:dev: info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
next-starter:dev: ERROR: command finished with error: command (examples/next-starter) yarn run dev exited (1)
next-starter-app:dev: ready - started server on 0.0.0.0:3000, url: http://localhost:3000
next-starter-app:dev: info - Loaded env from /Users/kos/git/onramplab/onr-react-ui/examples/next-starter/packages/app/.env