Fix inconsistency with search API config rendered item field (#387)

* Render landing pages to render_item field, drop page (for now) due to missing view mode

* Re-export including driving_instructor content

config/sync/search_api.index.default_content.yml

@@ -436,6 +436,8 @@ field_settings:
       roles:
         anonymous: anonymous
       view_mode:
+        'entity:gp':
+          gp: ''
         'entity:node':
           application: ''
           article: ''
@@ -493,6 +495,7 @@ datasource_settings:
         - application
         - article
         - contact
+        - driving_instructor
         - embargoed_publication
         - gp_practice
         - health_condition