no hover effect on badges as they are not interactive
use focus whenever hover is used

This shoud improve keyboard navigation quite a bit.
however there are two issues:

-   sometimes there are hover effects on elements which are not
    selectable

-   when you hover over an element you automatically hover over
    all its parents. This is not the case for focus

Selectors with one of these issues have been flagged
"FIXME not accessible"
Merge pull request #636 from xi/feature-use-focus-where-hover

use focus whenever hover is used