Add nteract front end

[willpuckett]

Add an option to use the nteract front end extension in docker-stacks containers. Additional conda forge package is 28MB.

The nteract front end provides a graphically clean front end interface ideal for both focused development and tidy presentations.

[willpuckett]

I initially PR'ed this to the https://github.com/sakuraiyuta/docker-stacks fork as I intend to use this primarily on ARM, but given this discussion, as well as its hopeful utility to others, I thought it might make more sense upstream.

[mathbunnyru]

Hi @willpuckett!

We've started to encourage fewer additions to the images here and more contributions to the recipes in the documentation (http://jupyter-docker-stacks.readthedocs.io/en/latest/using/recipes.html).

I think a recipe about how to add and configure nteract would make sense in the docs, if you would like to change PR (http://jupyter-docker-stacks.readthedocs.io/en/latest/contributing/recipes.html).

Also, as far as I understand, was last released on Jul 16, 2019, so the package is not updated anymore.
And it seems, that there is a deprecation plan.
nteract/nteract#5088 (comment)
So, I would rather see this as a recipe than adding to the base image.

[mathbunnyru]

Commented above the reason for changes

[willpuckett]

Thanks Ayaz. I think that's more appropriate as well.

Cheers,
WP

[mathbunnyru]

Converting to a draft till it's redone using the recipe approach.

[willpuckett]

Closing this. The process for a child image is already well documented, and documenting a deprecated package seems unnecessary.