CentOS wiki updates

I have been updating my proposal for the new CentOS wiki frontpage. The aim is to reduce the number of links a new visitor sees, so it is easier to remember later or memorize the structure of the wiki.

A wiki is essentially unstructured and it requires determination and effort to put structure into a wiki so people can remember the structure subconsciously. That is the hard part with wikis and the part I dislike most.