Starter Hello World site

[diego-codes]

All Gatsby starter sites have a hello world demo page to showcase the starter features: https://www.gatsbyjs.org/docs/gatsby-starters/

We can create a simple hello world page that mirrors the carbon-boilerplate output.

This issue is complete when:

• [ ] Hello World page that mirrors the Carbon boilerplate repo has been created
• [ ] The styles mirror the look and feel of the Carbon boilerplate output site

[diego-codes]

Removing this issue in favor of mimicking the blog style of the material design starter.