Various tweaks

- remove black border from banner
- make banners have internal columns
- make nav 2/3rd width, 19px text and more spaced out
- only show the ‘restricted mode’ banner where it’s needed
- rename ‘restricted mode’ to ‘trial mode’

tests/app/main/views/test_dashboard.py

@@ -16,5 +16,4 @@ def test_should_show_recent_jobs_on_dashboard(app_,
 
         assert response.status_code == 200
         text = response.get_data(as_text=True)
-        assert 'You haven’t sent any text messages yet' in text
         assert 'Test Service' in text