Redesigned people.php.net users listing.

I've redesigned users listing on people.php.net, it's now more consistent with rest of site. Oh and I suggest to revert border and shadow on header, because design of all php.net sites should be quite more consistent.

This pull request is complementary to [web-people PR](https://github.com/php/web-people/pull/6)
![new design](https://dl.dropboxusercontent.com/u/60020102/ShareX/2014-06/2014-06-15_20-36-46.png).