Make page engine doc more attractive

[jakub-g]

http://ariatemplates.com/usermanual/latest/page_engine

Currently this is one (which is good, wikification and too much spitting can be harmful) rather lengthy and detailed (not that good for the first reading) document .

I think it would be good to put some pictures, graphs etc. with the high-level overview to make it more digestible for mere mortals :)

Also it should be more emphasized what are the main advantages the page engine provides (animations and hash-based navigation AFAIU)