Point NPM reference at apache-annotator package

The project has not consulted the Incubator about releasing individual
packages in the @annotator scope yet. As such, the first release exists
as apache-annotator, with the individual packages bundled within. This
configuration may change in the future.
diff --git a/content/index.html b/content/index.html
index fff278e..ed04255 100644
--- a/content/index.html
+++ b/content/index.html
@@ -26,7 +26,7 @@
 
         <div class="right menu">
           <a class="item" href="demo"><span class="ui positive button">Demo!</span></a>
-          <a class="item" rel="external" href="https://www.npmjs.com/org/annotator">NPM</a>
+          <a class="item" rel="external" href="https://www.npmjs.com/package/apache-annotator">NPM</a>
           <a class="item" rel="external" href="https://github.com/apache?q=annotator#org-repositories">Code</a>
           <a class="item" rel="external" href="https://github.com/apache/incubator-annotator/issues">Issues</a>
           <a class="item" rel="external" href="https://github.com/apache/incubator-annotator/wiki">Wiki</a>