remove gif and explanatory text (#101)

Author: terakilobyte

source/fundamentals/aggregation.txt

@@ -57,39 +57,8 @@ Aggregation operations have some :manual:`limitations <core/aggregation-pipeline
      The :manual:`$graphLookup </operator/aggregation/graphLookup/>` stage has a strict memory limit of 100 megabytes
      and will ignore ``allowDiskUse``.
 
-
-Illustrated Example
-~~~~~~~~~~~~~~~~~~~
-
-In the following animation, every document in the collection enters the pipeline and is first filtered by
-the ``$match`` stage. In this example, the stage selectively matches documents that are either "red" or "blue",
-filtering "green" documents out. The documents continue flowing through the pipeline and enter the ``$project`` stage,
-which transforms them from squares to circles. Lastly, the documents flow into the ``$group`` stage, configured to
-produce the ratio of red to blue circles.
-
-.. figure:: /figures/agg_factory.gif
-   :border:
-   :alt: Animation showing how the aggregation pipeline works, conceptually.
-
-
-Using the **Aggregation builders** API, the same operation may look something like:
-
-.. literalinclude:: /includes/fundamentals/code-snippets/AggFactory.java
-   :language: java
-   :copyable: false
-   :dedent:
-   :start-after: begin aggregation
-   :end-before: end aggregation
-
-Which will produce output similar to the following:
-
-.. code-block:: none
-   :copyable: false
-
-   {"_id": 0, "red": 3, "blue": 2}
-
-Useful Links
-~~~~~~~~~~~~
+Useful References
+~~~~~~~~~~~~~~~~~
 
 - :manual:`Aggregation pipeline </core/aggregation-pipeline/>`
 - :manual:`Aggregation stages </meta/aggregation-quick-reference/#stages>`