[MNGSITE-152] fixed license and download links and added to plugin page too

git-svn-id: https://svn.apache.org/repos/asf/maven/archetype/trunk@1605464 13f79535-47bb-0310-9956-ffa450edef68
added menu link to plugin

git-svn-id: https://svn.apache.org/repos/asf/maven/archetype/trunk@1605474 13f79535-47bb-0310-9956-ffa450edef68