Add Launch in Hub button to tutorials

[adamjstewart]

Adds a "Launch in Hub" button similar to our existing "Open in Colab" button that opens a copy of the tutorial on the Planetary Computer. Note that this requires a Planetary Computer account to use.

@TomAugspurger @RitwikGupta

Closes #117

[TomAugspurger]

Cool! FYI, we should have torchgeo installed by default in the gpu-pytorch environment for the next release (mid January). But pip installing at runtime works for now.

[calebrob6]

"Launch in Hub" is a bit generic; does "Launch on Planetary Computer" look decent/fit?

Edit: just edited the file to check this myself

[adamjstewart]

I was just imitating the behavior in PC's own notebooks: https://planetarycomputer.microsoft.com/dataset/landsat-8-c2-l2#Example-Notebook

[TomAugspurger]

Yeah, in that case we're relying on the surrounding context to disambiguate what "Hub" means. I think for something like torchgeo's docs, "Open on Planetary Computer" makes a bit more sense.

[calebrob6]

Yeah I know. It is less ambiguous on the PC website as "Hub" is defined there, whereas there are a lot of Hubs out in the wild :)

[calebrob6]

I think I like "Open on Planetary Computer" the best:

[adamjstewart]

It's pretty wide, but it's definitely the most clear.

[calebrob6]

These will both look normal sized when we move to a better supported theme

[adamjstewart]

We overrode that, so there shouldn't be any issues with the theme. If you want to make them smaller I can change the height.

[adamjstewart]

May also want to consider Binder. Not explicitly designed for ML, and doesn't have GPUs, but could be useful.