Removed SDK category from update site

Signed-off-by: Florian Thienel <florian@thienel.org>
diff --git a/org.eclipse.vex.repository/site.xml b/org.eclipse.vex.repository/site.xml
index cdc51a2..52fe395 100644
--- a/org.eclipse.vex.repository/site.xml
+++ b/org.eclipse.vex.repository/site.xml
@@ -7,16 +7,11 @@
       <category name="vex_core"/>

    </feature>

    <feature url="features/org.eclipse.vex.sdk.feature_1.0.0.qualifier.jar" id="org.eclipse.vex.sdk.feature" version="1.0.0.qualifier">

-      <category name="vex_sdk"/>

+      <category name="vex_core"/>

    </feature>

    <category-def name="vex_core" label="Visual Editor for XML">

       <description>

          The Vex XML editor for document-style XML documents, including support for XHTML, DocBook and DITA.

       </description>

    </category-def>

-   <category-def name="vex_sdk" label="Vex SDK">

-      <description>

-         The Vex SDK contains all source bundles of the Visual Editor for XML.

-      </description>

-   </category-def>

 </site>