New N2VC interface + updated libjuju

This commit introduces the Python3 N2VC module, which acts as a standard
interface to the VCA.

The goal of this is to provide a common way for modules to interface
with the VCA.

- Updated libjuju from 0.6.1 to 0.7.3

Signed-off-by: Adam Israel <adam.israel@canonical.com>
Change-Id: Ide70fb5ae5797eb6486de24653dc09a23f9c009e
diff --git a/modules/libjuju/docs/index.rst b/modules/libjuju/docs/index.rst
index b4b075f..2dd55cb 100644
--- a/modules/libjuju/docs/index.rst
+++ b/modules/libjuju/docs/index.rst
@@ -11,17 +11,30 @@
 -----------------
 
 .. toctree::
+   :caption: Overview
    :glob:
    :maxdepth: 3
 
    narrative/index
-   API Docs <api/modules>
-   Internal API Docs <api/juju.client>
+
+
+.. toctree::
+   :caption: API Documentation
+   :glob:
+   :maxdepth: 3
+
+   api/modules
+   api/juju.client
+
+.. toctree::
+   :caption: Project
+   :glob:
+   :maxdepth: 3
+
    upstream-updates/index
+   changelog
 
 
-.. include:: changelog.rst
-
 
 Indices and tables
 ==================