[Cin] CinGG manual

[Andrea paz]

Phyllis has put the new revision of the manual on the website in PDF
and HTML. Some sections have been moved: Subtitles is now in Advanced
Editing and various rendering examples scattered throughout various
sections have been reunited in the Rendering chapter.
Do these variations sound good to you? Going back is easy with LaTeX.
The section on subtitles does not seem to be good to me. Do you have
suggestions on how to improve it, extend it and make it more useful?
If you have recommendations on certain parts of the manual, please
share them. By now the basic structure is stable, but the content
needs many improvements (for example Viewport and Camera/Projector,
etc).