Fix webview find CAB for light theme.
Modernize refresh handling.

Use swipe-to-refresh and modern progress bars.
Kill the ToolBar for now.

The ScrollView must be at the root of the view hierarchy for the
swipe-to-refresh scroll detection to work (albeit that could also be
done by overriding canChildScrollUp), and more importantly, it doesn't
actually do anything. We ultimately should think whether we should use a
navigation drawer for the (self) user activity.