Intake conversion Using_Explorer_tools

[rbeucher]

Following the discussion in issue #313, we propose converting the recipes to use Intake, given that the Cookbook is no longer supported and the ACCESS-NRI Intake catalog is now available.

A few months ago, @max-anu began working on this transition. This pull request contains the changes @max-anu made to the notebook specified in the title.

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[anton-seaice]

This change doesn't make sense.

The notebook Using_Explorer_tools is about using the explorer in the cosima cookbook, there is no equivalent for the Intake Catalogue at this point.

I suggest we leave this recipe unchanged, at some point we might make a new notebook to explore using the Intake Catalogue.

(Maybe we should add a note encouraging people to use the Intake Catalogue, and saying this recipes is for historical reasons only)

[rbeucher]

Sure. I have just created a bunch of PR based on @max-anu work. I did not go through all the changes and understand that some PRs might be irrelevant.

[anton-seaice]

Closing as no-change for now, we'll keep this notebook for reference for cookbook users.