The `MenuBar` component has been converted to a functional component.
This was done to make upcoming changes related to the home screen
redesign easier to implement.
Two tabs have been created on the home screen: 'Assets' and 'History'.
This tabbed view is shown only on small screens (e.g. in the popup).
The fullscreen view is unchanged.
The toggle-able left sidebar no longer exists, so some 'sidebar-left'
specific code and styles have been removed. The button in the menu bar
has been removed as well.
The 'History' title of the transaction history is now redundant when
where are no pending transactions, so it as been conditionally hidden.
A passthrough for `data-testid` has been added to the Tab component for
convenience in e2e tests.
Brad Decker
Erik Marks
Mark Stacey
Whymarrh Whitby
Chi Kei Chan
Alexander Tseung