Update to SDM workflow example in the docs

[tiemvanderdeure]

Uses SDM.jl/MLJ to do the whole workflow.

Also updated a few steps that are a lot less clunky now.

(And replaced plots.jl with makie, but feel free to reverse/improve).

[rafaqz]

Thanks, looks good

[tiemvanderdeure]

Hm I just took a look at the docs and the output of the last cells isn't shown - and it has @example in the top right. I must have made some typo?

[rafaqz]

Huh, I can't see anything obvious

[tiemvanderdeure]

Same, and it doesn't error either. It could be something with the SDM package as it's unregistered.

[rafaqz]

That shouldn't make a difference. I would guess a missing newline or something.

But also that package really wants registering ;)