Publish generated voltha-system-tests docs

Change-Id: If5b2d2892cb22255141692939e4e3d8ca691d33a
diff --git a/index.rst b/index.rst
index b22db7e..288e0fb 100644
--- a/index.rst
+++ b/index.rst
@@ -34,6 +34,12 @@
 
 .. toctree::
    :maxdepth: 1
+   :caption: Testing
+
+   testing/index.rst
+
+.. toctree::
+   :maxdepth: 1
    :caption: VOLTHA Core (outdated)
 
    voltha-go/README.md