Add styling examples

[coralvanda]

Add styling examples

As a Dash user, it would be helpful to know how the different styling possibilities actually work, and see them in action.

[mjclawar]

One possible way to do this is to have a markdown file with images or gifs of the working components, and to use a PropTypes parser to automatically generate separate markdown documentation from the js documentation.

[coralvanda]

As mentioned in #94 , the styling examples would be a great enhancement of the overall documentation.

[pieroliviermarquis]

+1. This library would be awesome if I could figure out how to style it.