Add Support for Sharereable dash link

[playermanny2]

Hi,

I would love to see a feature that allows jupyterlab-dash applications to be created with a shareable link. We're finding it's really cool so far, but for our users we would love to just share a link directly to a our dash without having to physically run the notebook first

Does this feature exists already, or is there a way to provide similar functionality?

Thanks!