docs: refresh and improve the "named data" sphinx theme

Change-Id: I6c04bb94e33191a2b0d32e0d7bc61ab44af9d84d
diff --git a/docs/conf.py b/docs/conf.py
index cd2092d..a2df0fc 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,10 +1,8 @@
-# -*- coding: utf-8 -*-
-#
 # Configuration file for the Sphinx documentation builder.
 #
 # This file only contains a selection of the most common options. For a full
 # list see the documentation:
-# http://www.sphinx-doc.org/en/master/config
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
 
 # -- Path setup --------------------------------------------------------------
 
@@ -87,6 +85,9 @@
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 
+html_copy_source = False
+html_show_sourcelink = False
+
 # Disable syntax highlighting of code blocks by default.
 highlight_language = 'none'