Option to display badges in footer

[elwayman02]

I'd like to find an easy way to display badges in the footer, such as Travis, Circle CI, EmberObserver, and Netlify status, among others.

This would be particularly helpful in making it easy for open-source projects to qualify for the Netlify open-source program, which requires that a "powered by Netlify" badge be displayed on the project's main page.

Enabling common badges via config (with a custom option) would be very useful!