On the What is GNU/Linux page, removed the screenshots slider

The slider makes that page too heavy (very subjective).
Removed a sentence on the What is GNU/Linux page

The sentence "A prominent, complete and friendly distribution to step into GNU/Linux is Ubuntu." was removed. This makes the text less biased towards a specific distribution.
Repositioned a quote on the Restrictions page
Increase space between columns on the More page
Credit SVGeezy on the Credits page
Display a nice alert box when the browser is outdated
Add credits for jQuery Cookie to the Credits page
Fix some rtl styles for the Try or Install page
Display the footer links horizontally

Works better on small screens.