text: Title: Interactive plots with Plotly: Link broken 404 error!
  Body: ## Tried to see the nbviewer: Interactive plots with Plotly clicking in the link you offer ## https://nbviewer.jupyter.org/github/plotly/python-user-guide/blob/master/Index.ipynb
  
  # got:
  
  404 : Not Found
  You are requesting a page that does not exist!
  
  The remote resource was not found.