[CentOS-docs] Screenshot on FrontPage

Hi again,

> I don't think it's a good idea to put a screenshot on the frontpage as
> the wiki should be used as technical reference and give an overview
> about the project itself as well as it's outcomes . I agree that a
> visual impression of CentOS would be nice but I think it shouldn't be
> part of the wiki frontpage. You may want to take a look at
...

an option could be to add a set of screenshots to the bottom of the
Download page showing current screenshots of the latest available
versions.

Best Regards
Marcus