assume Maven 3 as default (#20)

Author: elharo

src/site/apt/maven-3.apt.vm

@@ -30,7 +30,6 @@ under the License.
       <item name="FAQ" href="faq.html"/>
       <item name="History" href="history.html"/>
       <item name="Migrate" href="migrate.html"/>
-      <item name="Maven 3" href="maven-3.html"/>
       <!-- According to https://issues.apache.org/jira/browse/MNGSITE-152 -->
       <item name="License" href="http://www.apache.org/licenses/"/>
       <item name="Download" href="download.html"/>