[VOL-3802] Introducing architecture overview with component description

Change-Id: Ide16f03a4d0a03412a8043777aa00664fe6e4b61
diff --git a/index.rst b/index.rst
index f779afc..646f320 100644
--- a/index.rst
+++ b/index.rst
@@ -27,14 +27,16 @@
 <https://www.opennetworking.org>`_ `CORD project
 <https://www.opennetworking.org/cord/>`_.
 
-.. figure:: ./_static/voltha_components.svg
+.. figure:: ./_static/voltha_diagram.svg
    :alt: VOLTHA Component Diagram
    :width: 70%
+   :align: center
 
    VOLTHA Component Diagram
 
 Here some quick links to get you started:
 
+- :doc:`./overview/architecture_overview`
 - :doc:`./overview/deployment_environment`
 - :doc:`./overview/workflows`
 - :doc:`./overview/quickstart`
@@ -54,6 +56,7 @@
    :hidden:
    :glob:
 
+   overview/architecture_overview.rst
    overview/deployment_environment.rst
    overview/workflows.rst
    overview/quickstart.rst
@@ -69,7 +72,6 @@
    BBSIM <bbsim/docs/source/index.rst>
    OpenFlow Agent <ofagent-go/README.md>
    OpenOlt Adapter <voltha-openolt-adapter/README.md>
-   OpenOnu Adapter <voltha-openonu-adapter/README.md>
    OpenOnu Adapter Go <voltha-openonu-adapter-go/README.md>
    Openolt Agent <openolt/README.md>
    VOLTHA CLI <voltctl/README.md>