Make settings page a table not a browse list

There’s no way of seeing what the current settings are for a service
without individually going to the pages where you can change them.

This commit replaces the list of settings with a table. The table plays
back the current value for each setting.

This is a pattern that has worked well on various services[1] as well
as on our own user profile page.

1. https://designpatterns.hackpad.com/Check-your-answers-page-2DSpTH9J0wU

tests/conftest.py

@@ -43,6 +43,17 @@ def service_one(api_user_active):
     return service_json(SERVICE_ONE_ID, 'service one', [api_user_active.id])
 
 
+@pytest.fixture(scope='function')
+def service_with_reply_to_addresses(api_user_active):
+    return service_json(
+        SERVICE_ONE_ID,
+        'service one',
+        [api_user_active.id],
+        reply_to_email_address='test@example.com',
+        sms_sender='elevenchars',
+    )
+
+
 @pytest.fixture(scope='function')
 def mock_send_sms(request, mocker):
     return mocker.patch("app.service_api_client.send_sms")