Add xslTNG to the index page; remove 0.9.x releases

Author: ndw

index.html

@@ -48,5 +48,13 @@ <h2>DocBook XSLT 2.0 (XSLT 2.0 stylesheets)</h2>
         <a href="resources/">resources/</a>.</li>
       </ul>
     </section>
+
+    <section>
+      <h2>DocBook xslTNG (XSLT 3.0 stylesheets)</h2>
+      <ul>
+        <li>Packages are <a href="https://github.com/docbook/xslTNG/releases">on GitHub</a> or <a href="https://search.maven.org/search?q=a:docbook-xslTNG">in Maven</a>.</li>
+        <li>Online content is in <a href="release/xsltng/">release/xsltng/</a>.</li>
+      </ul>
+    </section>
   </body>
 </html>