Add something talking about our EFA affiliation

[bjb568]

https://www.eff.org/fight
https://ssd.eff.org

First task is we need to clarify what out affiliation is and how prominently we want to display it. This seems like something that could go on the About page, in the site-wide footer, or on the homepage. That depends how important the affiliation is.

[bentref]

Is this something that should go on the About page?