Prevented the override of the entry-page with the changed title "About"

Prevented the override of the entry-page with the changed title "About"

* The maven-site-plugin includes an entry for the index.html in the root
  of the documentation in the subdirectory "Project Info".
* This entry must be droped, because it overrides the correct definition
  for that page with a false title ("About") and path (the page is added
  as a child of the submenu "Project Info").