Landing + Donor Registration Frontend + Recipient Registration Frontend

I think this version of the landing page is good for now
Frontend for the donor registration should be done, but there's no backend that it hooks up to right now
Frontend for recipient registration is kinda there, but more fields need to get added

Mainly just wanted to open this to see if we wanna merge it, cuz I've had this branch out for a while and I have stuff in here that could be useful to other people (underscore, Foundation stuff set up for Foodshift styles, etc.). Since basically all my changes are on the frontend side anyways, nothing should break even if we merge this in