Sponsor logos are two wide instead of three

[kmugrage]

It makes for a pretty long list.

[bridgetkromhout]

Agreed that three-wide looks better.

[bridgetkromhout]

With the fix merged, do we want this issue so we revisit it for fix-optimizing later? /cc @mattstratton

[mattstratton]

I will tag this for the "future enhancements" milestone and move it out of "ready" state. This will likely get revisited when we redesign the UX anyway.

[bridgetkromhout]

This goes away if we switch to a sponsor footer (#295).