[documentation] lik to the excellent presentations by jnhtn++

source/documentation/index.html

@@ -92,6 +92,7 @@ <h3>Compendiums and cheatsheets</h3>
     <div id="misc" class="box">
     	<h3>Miscellaneous sources</h3>
     	<ul>
+            <li><a href="http://www.jnthn.net/articles.shtml">Presentations by Jonathan Worthington</a></li>
             <li><a href="http://search.cpan.org/~lichtkind/Perl6-Doc/lib/Perl6/Doc.pm">Perl6::Doc</a>, learn about Perl&nbsp;6 in your shell via perldoc</li>
             <li><a href="http://github.com/hinrik/grok/">Grok</a>, a Perl&nbsp;6 documentation reader</li>
             <li><a href="http://szabgab.com/">szabgab</a>'s <a href="http://szabgab.com/perl6.html">Perl&nbsp;6 Training Course material</a> and <a href="http://szabgab.com/perl6_tricks_and_treats.html">some general tips</a></li>