remove obsolete N4JS IDE Specification
diff --git a/userguides/index.html b/userguides/index.html
index 44dedf4..a11ea09 100644
--- a/userguides/index.html
+++ b/userguides/index.html
@@ -255,19 +255,6 @@
</div>
</div>
<div class="sect2">
-<h3 id="_n4js_ide_specification"><a class="link" href="#_n4js_ide_specification">N4JS IDE Specification</a></h3>
-<div class="paragraph">
-<p>For a reference of the N4JS IDE, i.e. the specific views and UI features of the Eclipse based IDE, the Specification is available at the following location:</p>
-</div>
-<div class="ulist">
-<ul>
-<li>
-<p><a href="https://www.eclipse.org/n4js/idespec/index.html">N4JS IDE Specification</a></p>
-</li>
-</ul>
-</div>
-</div>
-<div class="sect2">
<h3 id="_n4js_design_documentation"><a class="link" href="#_n4js_design_documentation">N4JS Design Documentation</a></h3>
<div class="paragraph">
<p>The design and other internal information valuable for contributors to Eclipse N4JS can be found at the following location:</p>
