feat(cli): make CLI works with Yarn 2 for React scripts projects
feat(cli): make CLI works with Yarn 2 for React scripts projects

Before, it was assumed that "When working with `create-react-app@>=2.0.0`, we know `babel-loader` is installed."
But `babel` is a peer dependency of `@storybook/core` (itself dep of `@storybook/react`) and so it must be added to the project's `package.json`

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