Fixed header bar so that search field is always visible

[davidbauer]

when scrolling down, a minimized version of the header is fixed to the top of the site, so that the search field can be used without having to scroll back to the top of the site.

[oliverwehn]

Would love to work on a general make-over, not only regarding the UI. As soon as I’m done with all my studio-related stuff back in Basel to the end of April, I’ll sketch out some of my ideas.