Reordered navigation-links, moving it to the top of the page.

Dear ckeen, 

the pastiche is the only page in call-cc.org that produces the navigation links (aka. menu) after the page content. With current chicken.css it doesn't matter as the menu is being displayed on top anyway, but as we are refactoring the chicken.css it would be much better if the HTML were produced in the 'correct' order. This way we could avoid relative and absolute positioning of the menu when it is not needed at all.

Thanks!

Best wishes,
Arthur