july12: add `mailto:` to mail URI
july12: add `mailto:` to mail URI

Currently, clicking on "get in touch" redirects you to https://www.battleforthenet.com/july12/team@fightforthefuture.org due to a missing mailto: in the anchor URI.
fightforthefuture/battleforthenet,fightforthefuture/battleforthenet,fightforthefuture/battleforthenet