docs: Enabling sphinx-based documentation and styling docs closer to named-data.net

Change-Id: Id80e0a4ba6f307159d4dcfdd7796189316a0c566
Refs: #1251
diff --git a/docs/index.rst b/docs/index.rst
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+NFD - Named Data Networking Forwarding Daemon's documentation
+=============================================================
+
+Contents:
+
+.. toctree::
+   release_notes
+   manpages
+   :maxdepth: 2