Add `cudf.pandas` notebook example for Databricks

[skirui-source]

This PR adds existing workflow example using cudf.pandas to the deployment docs.

This notebook has been tested in Databricks.

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[skirui-source]

CC @jacobtomlinson

• We should trim this example right down, perhaps just down to the CSV read.
• It would also be good to talk a bit about Databricks and how it is common for folks to use Pandas in Databricks Notebooks and how adding cudf.pandas will benefit them.
• We should link back to the full example at the end if they want to learn more about cudf.pandas and to give them a clear direction to go next.

In response to this, since the notebook isn't specific / relevant to Databricks deployment , we can just avoid documenting it altogether and instead do this:

• Under the 'Test RAPIDS' section of the Single-node instructions, in addition to the simple import cudf example, i can talk about the benefits of substituting pandas with cudf.pandas and link the original coLab notebook as a workflow example
• I think that's a better alternative to trimming down the original notebook

Thoughts?