DOCSP-50497 standardize toc tree and remove extra examples to be moved to server docs

Author: mballard-mdb

source/aggregation.txt

@@ -31,7 +31,7 @@ Aggregation
 Overview
 --------
 
-In this guide, you can learn how to use the MongoDB {+driver+} to perform
+In this guide, you can learn how to use the MongoDB Node.js Driver to perform
 **aggregation operations**.
 
 Aggregation operations process data in your MongoDB collections and return
@@ -97,12 +97,9 @@ Consider the following :manual:`limitations </core/aggregation-pipeline-limits/>
   property of the ``AggregateOptions`` object that you pass to the
   ``Aggregate()`` method. 
 
-- The :manual:`$graphLookup
-   </reference/operator/aggregation/graphLookup/>` stage has a strict memory
+- The :manual:`$graphLookup </reference/operator/aggregation/graphLookup/>` stage has a strict memory
    limit of 100 megabytes and will ignore the ``AllowDiskUse`` property.
 
-.. note /code-snippets/aggregation/agg.js deleted - check if file used elsewhere
-
 Aggregation Example
 -------------------
 
@@ -125,25 +122,23 @@ of New York City. To do so, the aggregation pipeline uses the following aggregat
   matching documents by the ``borough`` field, accumulating a count of documents
   for each distinct value in the ``borough`` field.
 
-.. io-code-block::
-
-   .. input:: /code-snippets/aggregation/agg.js
-      :start-after: begin aggregation
-      :end-before: end aggregation
-      :language: javascript
-      :dedent:
-
-   .. output::
-      :language: console
-      :copyable: false
-      :visible: false
-
-      { _id = Bronx, Count = 71 }
-      { _id = Brooklyn, Count = 173 }
-      { _id = Staten Island, Count = 20 }
-      { _id = Missing, Count = 2 }
-      { _id = Manhattan, Count = 221 }
-      { _id = Queens, Count = 204 }
+.. literalinclude:: /code-snippets/aggregation/agg.js
+   :start-after: begin aggregation
+   :end-before: end aggregation
+   :language: javascript
+   :dedent:
+
+This example produces the following output:
+
+.. code-block:: json
+   :copyable: false
+
+   { _id = Bronx, Count = 71 }
+   { _id = Brooklyn, Count = 173 }
+   { _id = Staten Island, Count = 20 }
+   { _id = Missing, Count = 2 }
+   { _id = Manhattan, Count = 221 }
+   { _id = Queens, Count = 204 }
 
 Additional information
 ----------------------