Gatsby example

This is the solution to the [issue 28431] (gatsbyjs/gatsby#28431)

Example from here [https://github.com/mui-org/material-ui] taken and removed layout as it was not required for this solution.

How to use

Install it and run:

npm install
gatsby build
gatsby serve

The idea behind the example

Gatsby is a static site generator for React.