Remove duplicated h1 headings where semantic subheadings are appropriate...

. Also removing margins and heights for a given sponsor block when the max-size for logos will suffice. It won't take into account line-height and will get funky going forward, and besides, it creates a ton of extra whitespace and makes the vertical rhythm look janky.

I changed the headings because you should avoid using more than one h1 tag for a given page, and it also breaks the idea of semantic subheadings, of which these definitely are. The prominence of a given sponsor block is denoted by the size of the logos themselves, so I think that approach is sufficient.

Cheers!