Switch org and service order on home page

This matches what’s on the performance page – orgs on the left, services
on the right.

tests/app/main/views/test_index.py

@@ -34,10 +34,10 @@ def test_non_logged_in_user_can_see_homepage(
 
     assert normalize_spaces(page.select_one('#whos-using-notify').text) == (
         'Who’s using GOV.UK Notify '
-        'Services '
-        '9,999 services '
         'Organisations '
         '111 organisations '
+        'Services '
+        '9,999 services '
         'See the list of services and organisations.'
     )
     assert page.select_one('#whos-using-notify a')['href'] == (