Docs take much longer to build

[angela97lin]

I noticed that docs have been taking much longer to build. I think this is likely because the automl docs were changed in c871f3b to use the fraud dataset, instead of the breast cancer data set (+ elsewhere?) to showcase infer_problem_types, since the breast cancer dataset only has numeric columns.

[dsherry]

I think the main reason for this is that we changed the defaults for automl, from n_iterations=5 to n_batches=1 which will now run 9 pipelines.

Closing as a duplicate of #1420