cookbook: Fix build so CSS files get installed
cookbook: Fix build so CSS files get installed

I had changed the build so CSS files get put into
the HTML build directory; but done it in such
a way that they were then being ignored during
install. Fixed this.

GNOME/clutter,ebassi/clutter,djdeath/clutter,rkudiyarov/clutter_osx,djdeath/clutter-android,heysion/clutter-clone,jigpu/clutter,heysion/clutter-clone,ebassi/clutter,dlespiau/clutter,spatulasnout/clutter,djdeath/clutter-android,djdeath/clutter,djdeath/clutter-multithreaded,rkudiyarov/clutter_osx,spatulasnout/clutter,spatulasnout/clutter,kerrickstaley/clutter-vala,nobled/clutter,collects/clutter,djdeath/clutter-multithreaded,djdeath/clutter,heysion/clutter-clone,Distrotech/clutter,jigpu/clutter,collects/clutter,Distrotech/clutter,spatulasnout/clutter,nobled/clutter,collects/clutter,djdeath/clutter,GNOME/clutter,Distrotech/clutter,collects/clutter,jigpu/clutter,djdeath/clutter-multithreaded,djdeath/clutter,Distrotech/clutter,ebassi/clutter,kerrickstaley/clutter-vala,Distrotech/clutter,dlespiau/clutter,GNOME/clutter,rkudiyarov/clutter_osx,heysion/clutter-clone,djdeath/clutter-android,jigpu/clutter,ebassi/clutter,Distrotech/clutter,collects/clutter,kerrickstaley/clutter-vala,ebassi/clutter,djdeath/clutter-android,GNOME/clutter,djdeath/clutter-multithreaded,djdeath/clutter,jigpu/clutter,nobled/clutter,djdeath/clutter-android,jigpu/clutter,rkudiyarov/clutter_osx,GNOME/clutter,heysion/clutter-clone,spatulasnout/clutter,kerrickstaley/clutter-vala,dlespiau/clutter