Integrate CosmoNote waveform viewer with PhysioNet

[tompollard]

CosmoNote is a waveform viewer developed as part of the COSMOS project: https://cosmos.isd.kcl.ac.uk/

The COSMOS team have demonstrated how CosmoNote can be used to render PhysioNet datasets:
https://cosmonote.isd.kcl.ac.uk/physionet.html

We should work out how best to integrate CosmoNote with PhysioNet. This might be adding external links to the platform hosted by the CosmoNote team or (perhaps better) serving CosmoNote directly from the PhysioNet servers.