text: Title: cose-bilkent does not work
  Body: few issues with this
  
  https://github.com/plotly/dash-cytoscape/blob/master/demos/usage-cose-bilkent-layout.py
  
  throws an error about the conflict between serving locally and external scripts
  
  You have set your config to `serve_locally=True` but A local version of https://cdn.rawgit.com/cytoscape/cytoscape.js-cose-bilkent/d810281d/cytoscape-cose-bilkent.js is not available.
  If you added this file with `app.scripts.append_script` or `app.css.append_css`, use `external_scripts` or `external_stylesheets` instead.
  See https://dash.plotly.com/external-resources
  
  
  seems like you have built in 'close-bilkent' into your code somewhere instead of 'cose-bilkent' as you get an error pop up saying it is looking for 'close-bilkent'
  
  Invalid argument `layout.name` passed into Cytoscape with ID "cytoscape".
  Expected one of ["random","preset","circle","concentric","grid","breadthfirst","cose","close-bilkent","cola","euler","spread","dagre","klay"].
  
  
  demo works if you replace the external script loading with
  
  cyto.load_extra_layouts()
  
  then replace all instances of 'close-bilkent' in the local cyto files with 'cose-bilkent'
  