Add link to slides/conferences

shexstatements/templates/about.html

@@ -13,6 +13,10 @@ <h3>Source code</h3>
         <ul>
          <li><a href="https://github.com/johnsamuelwrites/ShExStatements">ShExStatements on Github</a></li>
         </ul>
+        <h2>Conferences</h2>
+        <ul>
+  	  <li><b>ShExStatements: Simplifying Shape Expressions for Wikidata </b>, John Samuel, Wiki Workshop 2021 (held at The Web Conference 2021), 14 April 2021 (<a href="https://wikiworkshop.org/2021/papers/Wiki_Workshop_2021_paper_14.pdf">Link</a>, <a href="https://figshare.com/articles/presentation/ShExStatements_Simplifying_Shape_Expressions_for_Wikidata/14398916">PDF</a>)</li>
+        </ul>
         <h2>Demonstration</h2>
         <p>Online demonstrations are also available:</p>
         <ul>