docs: Small updates and visual improvements of resulting HTML

Change-Id: Ic707fdb2625a6d4d9695c4d7f97b72e0617c1a6f
diff --git a/docs/index.rst b/docs/index.rst
index 2c611c9..9cd0035 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -25,9 +25,11 @@
 ndn-cxx Documentation
 ---------------------
 
-- `API documentation (doxygen) <doxygen/annotated.html>`_
 
 .. toctree::
+   :hidden:
+   :maxdepth: 2
+
    RELEASE_NOTES
    INSTALL
    examples
@@ -36,7 +38,27 @@
    tutorials/security-validator-config
    manpages
    code-style
-   :maxdepth: 1
+
+- `API documentation (doxygen) <doxygen/annotated.html>`_
+
+- :doc:`ndn-cxx v0.1.0 Release Notes <RELEASE_NOTES>`
+
+- :doc:`Getting Started with ndn-cxx <INSTALL>`
+
+- :doc:`Tutorial Examples <examples>`
+
+- :doc:`tutorials/security-library`
+
+- :doc:`tutorials/utils-ndn-regex`
+
+- :doc:`tutorials/security-validator-config`
+
+- :doc:`manpages`
+
+Documentation for ndn-cxx contributors
+++++++++++++++++++++++++++++++++++++++
+
+- :doc:`code-style`
 
 License
 -------