Site header bugs - Githubissues

You'll need to pull from dev to review this PR.

Things I did:

Added Algolia for search results and used js to make the results disappear when the search bar is closed
Made the search input wider on desktop
Added a hover and focus state to search buttons
Made the topics dropdown menu accessible
Added a focus state for all elements except for buttons and post block titles, as those had defined styles
Hamburger/menu close buttons have the same transition speed as the clip-path
On mobile, the topics submenu defaults to showing

CSIS-iLab / reconasia_wp