Revert "Remove unused Page view on Case Study"

This reverts commit c57225a693.

Apparently Views doesn't work if there isn't page display.

Known bug, https://drupal.org/node/2655694

Ref #43

config/sync/views.view.case_study.yml

@@ -295,3 +295,35 @@ display:
         - 'languages:language_content'
         - 'languages:language_interface'
       tags: {  }
+  page_listing:
+    display_plugin: page
+    id: page_listing
+    display_title: Page
+    position: 1
+    display_options:
+      display_extenders: {  }
+      path: case-study-listing
+      menu:
+        type: normal
+        title: Work
+        description: 'See some of what we''ve built.'
+        expanded: false
+        parent: ''
+        weight: -41
+        context: '0'
+        menu_name: main
+        enabled: false
+      pager:
+        type: none
+        options:
+          offset: 0
+      defaults:
+        pager: false
+        css_class: false
+      css_class: is-dark
+    cache_metadata:
+      max-age: -1
+      contexts:
+        - 'languages:language_content'
+        - 'languages:language_interface'
+      tags: {  }