Add search bar interaction to header

[chrabyrd]

This component is comprised of 3 parts:

1. An icon in the header that when clicked toggles display state of a search bar below the header
2. The search bar whose display state is toggled by icon click, with a button on the far-right of the component that clears the search bar
3. Search results

For this iteration, the search results component should have pagination, and each search result should display an icon, the name, and the hierarchy path.

This is a loose representation of the ask. It does not have the icon show/hide interaction. For now ignore the dropdown on the left, the Search Options on the right, and the sorting/filtering interactions.

[chrabyrd]

blocked by #12