Pack request: ObservableHQ

Add a pack that supports Notebooks and visualisations created from ObservableHQ.
It is possible to pass parameters from Coda to Observable notebooks, and with this Coda would benefit from a rich range of graphs and advanced visualisations (mind maps, trees, geographic maps and more).

Currently, embedding an Observable notebook does not seem possible in Coda, as the embedding technique relies either on using an iframe with an embedded document as source, or loading the Observable javascript library plus some custom code.

Some projects have embedded Observable and even support passing variables between their system and Observable:


The integration could be a function like this:

= Observable(
  showCells:['chart', 'height']
  variables: @VariablesTable)