docs: Add documentation to index page surrounding bulk actions

Closes #183

docs/_partials/pages/index/bulk-actions.rst

@@ -0,0 +1,27 @@
+Bulk Actions
+------------
+
+The Crud plugin provides bulk actions which can be easily used with crud view.
+
+To set up crud action in controller do something like this in initialize method.
+
+.. code-block:: php
+
+    $this->loadComponent('Crud.Crud', [
+        'actions' => [
+            'deleteAll' => [
+                'className' => 'Crud.Bulk/Delete',
+            ],
+        ]
+    ]);
+
+Once a bulk action has been mapped, the ``scaffold.bulk_actions`` configuration
+key can be specified. The ``scaffold.bulk_actions`` configuration key takes an
+array of key/value pairs, where the key is the url and the value is the title.
+
+.. code-block:: php
+
+    $action = $this->Crud->action();
+    $action->config('scaffold.bulk_actions', [
+        Router::url(['action' => 'deleteAll']) => __('Delete records'),
+    ]);

docs/basic-usage.rst

@@ -491,30 +491,7 @@ alter the ``contain()`` list for the pagination query:
         return $this->Crud->execute();
     }
 
-Bulk Actions
-------------
-
-The Crud plugin provides bulk actions which can be easily used with crud view.
-
-To set up crud action in controller do something like this in initialize method.
-
-.. code-block:: php
-
-    $this->loadComponent('Crud.Crud', [
-        'actions' => [
-            'deleteAll' => [
-                'className' => 'Crud.Bulk/Delete',
-            ],
-        ]
-    ]);
-
-Then you need to configure scaffold to display select with actions.
-
-.. code-block:: php
-
-    $action->config('scaffold.bulk_actions', [
-        Router::url(['action' => 'deleteAll']) => __('Delete records'),
-    ]);
+.. include:: /_partials/pages/index/bulk-actions.rst
 
 Going Forward
 -------------

docs/index-pages/customizing-the-index-page.rst

@@ -19,6 +19,7 @@ in scope. To limit the fields used, simply specify an array of fields:
 .. include:: /_partials/fields/formatter-element.rst
 
 .. include:: /_partials/pages/index/buttons.rst
+.. include:: /_partials/pages/index/bulk-actions.rst
 .. include:: /_partials/pages/index/finder-scopes.rst
 .. include:: /_partials/pages/index/filters.rst
 .. include:: /_partials/pages/index/multiple-pages.rst