Display and usability improvements.

•	Ensures that homepage content that is "featured" is not also duplicated into the "News" block" #222. PWW
•	Corrects focus state and tab order when using keyboard navigation. This mostly affects users of assistive technology such as screen readers or alternate input devices. #179. PWW
•	Adjusts search results display on mobile devices so it uses more of the screen space instead of wrapping #225. PWW
•	Improves data visualization layouts, especially on smaller devices. For example, the chart of most expensive races now shows the campaign rather than having to hover to see it #171. PWW