Implement the new search bar on the top nav

Using the old search functionality, provide a top search bar that fills the main panel of the new navigation

New designs on gitlab

https://design.minds.com/hosted/web/michael/front%232148-navigation/#artboard2

Responsive

https://design.minds.com/hosted/web/michael/front%232148-navigation/#artboard7 https://design.minds.com/hosted/web/michael/front%232148-navigation/#artboard21

Light mode

https://design.minds.com/hosted/web/michael/front%232148-navigation/#artboard12 https://design.minds.com/hosted/web/michael/front%232148-navigation/#artboard14

• Use the existing feature flag for the new navigation
• Use the existing search functionality, this is just to reskin the search bar into the new design
• Search should go to the existing discovery feed
• unit tests for the new search box
• e2e tests for the new search box
• responsive design for web
• light mode
• dark mode