Added a link for face-varying to the nav sidebar
Added a link for face-varying to the nav sidebar

shengfuintel/OpenSubdiv,c64kernal/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,c64kernal/OpenSubdiv,c64kernal/OpenSubdiv,shengfuintel/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv,lookup1980/OpenSubdiv,xldeveloper/OpenSubdiv,nyotis/OpenSubdiv,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv,shengfuintel/OpenSubdiv,anshuarya/OpenSubdiv