Update site descriptor, use site configuration from parent

fix #754
diff --git a/src/site/site.xml b/src/site/site.xml
index 174a2dc..deae4ef 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -19,34 +19,8 @@
 under the License.
 -->
 
-<project xmlns="http://maven.apache.org/DECORATION/1.0.0"
-  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/DECORATION/1.0.0 http://maven.apache.org/xsd/decoration-1.0.0.xsd">
-
-  <bannerLeft>
-    <src>http://maven.apache.org/images/apache-maven-project.png</src>
-    <href>http://www.apache.org/</href>
-  </bannerLeft>
-
-  <bannerRight>
-    <src>http://maven.apache.org/images/maven-logo-black-on-white.png</src>
-    <href>http://maven.apache.org/</href>
-  </bannerRight>
-  <skin>
-    <groupId>org.apache.maven.skins</groupId>
-    <artifactId>maven-fluido-skin</artifactId>
-    <version>1.6</version>
-  </skin>
-
-  <custom>
-    <fluidoSkin>
-      <sourceLineNumbersEnabled>true</sourceLineNumbersEnabled>
-      <googlePlusOne />
-      <googleSearch>
-        <sitesearch/>
-      </googleSearch>
-    </fluidoSkin>
-  </custom>
+<site xmlns="http://maven.apache.org/SITE/2.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="http://maven.apache.org/SITE/2.0.0 https://maven.apache.org/xsd/site-2.0.0.xsd">
 
   <body>
     <menu name="Overview">
@@ -70,4 +44,4 @@
       <item name="Using another Shader implementation" href="examples/use-shader-other-impl.html"/>
     </menu>
   </body>
-</project>
+</site>