Integrate some tutorials with links given on the "Learn" page of the MLJ documentation

[ablaom]

Towards improving integration of the new landing page provided by juliaml.ai (content provided by this repo) this PR adds tutorial links from this MLJ docs page. This latter page already duplicates a lot of DataScienceTutorials.jl, and after this PR, could be condensed significantly to reduce duplication.

The idea is to dispatch a user to:

• DataScienceTutorials.jl for "curated" tutorials to be attempted in sequence

• juliaml.ai/tutorials for a complete list of all known tutorials, organized by topic.

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[ablaom]

@EssamWisam This PR adds two new tutorial tags, "Exploratory Data Analysis" and "Model Composition", and at least one new tutorial with each tag. However, these new categories are not being populated by the new tutorials, i.e, the lists for these new tags are blank, as here:

Is it possible that we need to add the tags in a separate PR to get the preview to work properly? What's your suggestion for proceeding?

[ablaom]

Thanks @EssamWisam for the lightning response and resolution ⚡

[ablaom]

@dm13450, @roland-KA FYI: This PR includes links to MLJ tutorials you contributed and adds some "learning outcomes" (which appear in the tutorial browser when you hover over a tutorial). Feel free to comment on those.