Make the sponsor section look nicer

[BrandonWerbel]

• Currently, only 3 logos show up in a row. This means there's a lot of horizontal margins, and it takes too much vertical space.
• The sponsors section disappears when the screen width is less than 1290 pixels, even though the screen size doesn't seem to affect them until much later. We should probably try to shrink the logos with the screen width when its between a certain size, then choose a point at which to make them disappear entirely.