site: Move Haxe stuff into frontend subdirectory.

As Haxe more or less is only the interactive frontend, this might be a
better place where it should reside. At least for now, until we have
decided on the final layout, but we can still change it later.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
site: Make counter motion blur more visible.

This now uses a white color for the transition between the corresponding
digits of the counter, making motion blur a bit more visible.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>