A fleshed-out landing page

Worked with @mollymcleod to redesign the landing page. This adds a lot of content, collects user emails and requested story topics, displays info about our editorial board and direction, etc.

(@jeremiak @jden i'm terrible at javascript and do some hacky google form stuff here to show a submitted modal and not load google's response page, would love to work with you to make it less terrible)