Revert css overflow setting (#2575)
Revert css overflow setting (#2575)

* reposition left menu (docs ToC)

* remove commented lines

* revert overflow scroll

MHBauer/service-catalog,MHBauer/service-catalog,MHBauer/service-catalog,kubernetes-sigs/service-catalog,kubernetes-sigs/service-catalog,kubernetes-sigs/service-catalog,MHBauer/service-catalog,kubernetes-incubator/service-catalog,kubernetes-sigs/service-catalog,MHBauer/service-catalog,kubernetes-sigs/service-catalog,kubernetes-incubator/service-catalog,kubernetes-incubator/service-catalog,kubernetes-incubator/service-catalog,kubernetes-sigs/service-catalog,MHBauer/service-catalog,kubernetes-incubator/service-catalog,kubernetes-incubator/service-catalog