Add workflow example for dask databricks

[skirui-source]

Fixes #298

[review-notebook-app]

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[jacobtomlinson]

Thanks @skirui-source.

I've made a few specific comments in ReviewNB but also would you address the following high-level things:

• Can you add tags to the notebook?
• The build is unhappy. I think it doesn't like the notebook cell metadata for some reason. Perhaps because it was saved in Databricks. Could you open an issue to track this and start looking into a solution?
• Could you give it another spelling/grammar pass as I noticed a few things but it's hard to suggest edits on GitHub for notebooks?
• Can you check the consistency on the spelling of things like Dask/RAPIDS, cuDF, etc.

Thanks!

[jacobtomlinson]

I looks like one comment was marked as resolved but not actually completed. Could you look at adding some more links throughout? Generally whenever we mention a technology like Dask, XGBoost, etc for the first time in a page we should link to it.

Also it looks like the build is still failing

/home/runner/work/deployment/deployment/source/examples/xgboost-dask-databricks/notebook.ipynb:40002: WARNING: skipping unknown output mime type: application/vnd.databricks.v1+bamboolib_hint [mystnb.unknown_mime_type]

Could you fix that up? Thanks!

[jacobtomlinson]

I removed the metadata that sphinx was complaining about.