[pr to jr/arrow] Pluto notebook version of the tour

[ericphanson]

I converted the tour to a Pluto notebook to help me explore the PR and figured it might be useful:
🎈 tour_pluto.jl ⚡ Pluto.jl ⚡.pdf

(I committed the Manifest to keep the relative path from examples to Onda)

[jrevels]

ooooh I like this idea.

I'm not a Pluto-er, so this might not be a good idea, but would it be possible to have only the original tour.jl + Manifest.toml actually checked-in and just provide a snippet that one can use to autogenerate a Pluto notebook if they'd like to go through it via Pluto? I'd like to keep the plain Julia file around just because it seems cleaner/easier to read outside of Pluto, but would be good not to have to maintain two copies.

Alternatively could keep the Pluto version checked-in, but just generate it via CI so we don't have to worry about it going out of sync.

[ericphanson]

I think it would be possible to generate the Pluto notebook from the .jl file via fredrikekre/Literate.jl#120 when that's finished. One subtlety is I had to make some manual adjustments to variable names because in Pluto, you can't rebind the same variable in two different places (due to the reactive paradigm where there's supposed to be only a single simultaneously-valid global scope). So we could make those changes to the source and then autogenerate the Pluto file in CI and then test it doesn't error to ensure it stays valid.

[ericphanson]

I'm going to close this because I think it'll just be a maintenance burden unless we figure out an automatic solution, and I'm hopeful the ecosystem will develop more tooling in that area that'll make that easier in the future and we can pick it up then.