Adapt menu of the pages mainly related to the studio

[dvojtise]

Pages strongly related to the Studio should have a main menu which is not "Initative" driven in order to provide 1 click access to useful item for a user or newcomer.
Ie. something like " Download / Documentation / Gallery / Community / Initiative " similar to Sirius or Xtext technical sites.

note: this does not means that we have to change the host, but only change the top header for those pages

Initiative related pages could remain as they are now since there is already a "studio" menu in their header.