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

Change-Id: Id80e0a4ba6f307159d4dcfdd7796189316a0c566
Refs: #1251
diff --git a/docs/manpages/nfd.rst b/docs/manpages/nfd.rst
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+nfd
+===
+
+Synopsis
+--------
+
+::
+
+    nfd [options]
+
+
+Description
+-----------
+
+::
+
+    [--help]   - print this help message
+    [--modules] - list available logging modules
+    [--config /path/to/nfd.conf] - path to configuration file (default: /usr/local/etc/ndn/nfd.conf)