I just found here a very interesting paper on exactly what I was trying to explain to my UCA colleagues this morning.
I can see in this paper that ipython (this would now be jupyter) is mentioned as the technologies used inside authorea; the authors also say
In [GJP15], we also provide a simple iPython example of computing and
plotting the normal distribution
So I guess I'm giving this another try to understand if/how I can create a notebook from scratch under authorea