Various splash fixes

- Ad disappears if window is too small
- New smaller like button (should fix https://github.com/Brickimedia/brickimedia/issues/152)
- The "data circles" should show up with correct data (note that currently they use JS to query the data; ideally they'll eventually use PHP)

Note that the background scroll effect is still disabled on mobile; currently, the background image scrolls to such a degree you can see behind it, but if there's interest I can try to come up with a fix.