Add component library style for search-related controls

[alundgard]

Depending on the branch currently on stage, the search controls may be displayed in beige or in Stanford cardinal red. Example exhibit.

We'd like to move toward the component library style, which uses Stanford digital blue. For example, see EarthWorks.

[alundgard]

It looks like this hover color issue is also appearing in Exhibits: sul-dlss/component-library#60.

[dnoneill]

@jcoyne Are you going to have time for this or should we move it back into ready?

[jcoyne]

@dnoneill is this done?

[dnoneill]

Yeah looks like.