[DOXIA-503] don't mark abstract parser as Plexus component since it cannot be instanciated by Plexus

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1604367 13f79535-47bb-0310-9956-ffa450edef68
[MNG-152]  add license and download links

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1604377 13f79535-47bb-0310-9956-ffa450edef68
improved intro

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1604379 13f79535-47bb-0310-9956-ffa450edef68
don't inherit introduction menu

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1604391 13f79535-47bb-0310-9956-ffa450edef68