add link for output demo
add link for output demo

fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook,fboehm/cboettig_site,antass/labnotebook3,fboehm/cboettig_site,fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook