CLI for simpler project setup

[sapegin]

Initial Styleguidist configuration is still complicated and might turn off potential users. We can make initial setup much easier with a CLI tool like React Storybook does:

npm i -g getstorybook
cd my-react-app
getstorybook

It contains lots of useful magic like detection of project type (create-react-app, custom Webpack, etc.), yarn/npm, etc. We may even fork getstorybook and tweak it for Stylegudist.

What I want CLI to do:

• Detect create-react-app and add it’s own Webpack config.
• Add useful default Webpack loaders.
• Detect/ask components option.
• Add npm scripts.
• Add and install npm dependencies.
• What else we can do?