Remove platform admin toggle for basic view

Since platform admins can use the new settings page, this commit:
- links to that page
- removes the platform-admin-only endpoint that switches basic view on
  and off

tests/app/main/views/service_settings/test_service_setting_permissions.py

@@ -44,11 +44,6 @@ def get_service_settings_page(
     ({'permissions': []},
         '.service_switch_can_upload_document', {}, 'Allow to upload documents'),
 
-    ({'permissions': []},
-        '.service_switch_caseworking', {}, 'Allow basic view'),
-    ({'permissions': ['caseworking']},
-        '.service_switch_caseworking', {}, 'Stop basic view'),
-
     ({'permissions': ['sms']}, '.service_set_inbound_number', {'set_inbound_sms': True}, 'Allow inbound sms'),
 
     ({'active': True}, '.archive_service', {}, 'Archive service'),