Add navbar
Added a navbar using MUI.
Search bar is now in the header and redirects to the /search page to display the results.
The drawer menu with the setting and the available views is now rendered using MUI, removing the need for react-burger-menu.
The yasgui button is always visible in the navbar when we have an endpoint configured. The button to open the current uri is only visible when we are browsing on a uri.
AppBar is now white:
