fixed image location and link

Author: acostadon

…ocs/source/_static/cugraph-pyg-stack.png …urce/graph_support/cugraph-pyg-stack.pngdocs/cugraph-docs/source/_static/cugraph-pyg-stack.png renamed to docs/cugraph-docs/source/graph_support/cugraph-pyg-stack.png docs/cugraph-docs/source/_static/cugraph-pyg-stack.png renamed to docs/cugraph-docs/source/graph_support/cugraph-pyg-stack.png

@@ -10,8 +10,8 @@ The cuGraph team is not planning any further work in the DGL ecosystem going for
 
 The cuGraph GNN stack
 
-.. image:: ../../_static/cugraph-pyg-stack.png
-   :alt: The cuGraph-
+.. image:: cugraph-pyg-stack.png
+   :alt: The cuGraph PyG Stack
    :width: 400px
    :align: center