test sidenav and topnav colors

Experiment with active and visited colors.

Added links for testing to content of tmp/test.html
as well.

tmp/test.html

@@ -96,6 +96,12 @@ uptime
 sudo shutdown -p now
 </pre></code>
 
+    <p><a href="http://www.isthe.com">http://www.isthe.com</a></p>
+
+    <p><a href="http://www.example.org">http://www.example.org</a></p>
+
+    <p><a href="https://www.example.org">https://www.example.org</a></p>
+
     <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.
       Nibh mauris cursus mattis molestie a iaculis at erat pellentesque.
       Faucibus purus in massa tempor nec feugiat.