Switch base to rocker/binder image

[yuvipanda]

• Matches what we do in other images
• Simplifies this image a lot
• Knitting still takes time the first time even if we just switch to new base image. But binder: Install packages required for Jupyter to PDF convert rocker-org/rocker-versioned2#714 installs some of the texlive packages that are being installed the first time, and should speed things up.

Ref 2i2c-org/infrastructure#3178

[github-actions]

👈 Test this PR on Binder

[GeorgianaElena]

Thanks @yuvipanda!

Matches what we do in other images

Would love to have some quick bullet points written about this in https://infrastructure.2i2c.org/howto/update-env/#update-the-default-user-environment as I believe that one is not accurate anymore, right?

But totally not related with this PR which can be merged as it is 🚀

[yuvipanda]

@GeorgianaElena I think this is documented in https://infrastructure.2i2c.org/howto/features/rocker/ as us prefering using rocker/binder image. Do you think that's enough?

[GeorgianaElena]

@yuvipanda, yes, totally. That does a great job explaining the why and how <3

I think maybe what we're missing is a central place like https://infrastructure.2i2c.org/howto/update-env/#manage-a-hub-s-user-environment that explains the when?

Maybe an aggregator docs page of 2i2c "recommended" images and when they can be used (like proposed in 2i2c-org/infrastructure#3103), followed by the guide on how to use the repo2docker action to quickly build on top of them if/when needed.

I believe I'm imagining your great JupyterCon talk in a docs page with links towards pages like https://infrastructure.2i2c.org/howto/features/rocker/ if that makes sense :D