Convert tutorial to use intake

[AndyHoggANU]

This PR updates the COSIMA Cookbook Beginner Tutorial and addresses #464.
The tutorial is now intake-ified and cleaned up a little, but other suggestions very welcome.

I've also retained the old tutorial under a different name, but maybe we should delete it altogether (as we really don't want new users adopting the old cookbook).

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[navidcy]

Do we need to keep the deprecated cosima_cookbook.getvar tutorial?

[AndyHoggANU]

Do we need to keep the deprecated cosima_cookbook.getvar tutorial?

I don't think so. Happy for you to make the executive decision to delete.

[navidcy]

I'm so happy to delete deprecated stuff. It brings a sensation of liberation.

[adele-morrison]

Yep I’m all for deleting too! I think we now have intake working with all the mom6 configs and most of the cj50 exps are in intake now too.

[adele-morrison]

Possibly the only useful thing remaining associated with the cookbook is the explorer tools that I don’t think we have a replacement for yet with intake.

[navidcy]

@AndyHoggANU this looks great! I tweaked the language a bit and added cf_xarray to use .sel(longitude=...) instead .sel(xu_ocean=...).

[navidcy]

Great!

[AndyHoggANU]

Merging - @charles-turner-1 don't worry about the review, but feel free to check it out on Monday.