We have a footer that should link to an about page but no about page.

• use react-router to link the footer on the home page to the about page. The route for it already exists in App.js
• Implement the About.js component. It should look similar to the login page
  • reuse the main header from the login page
  • replace the login form with text. It is fine to use lorum ipsum placeholder text for now. There is a separate issue to write the copy for the about page.