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Add PCA Estimator documentation to Python API Docs

Description

pca.py isn't part of the docs build. add it in and reformat the css layout so that it doesn't cut off funny (`H2OPrincipalComponentAnalysisEstimator` is much longer than the other estimator titles)

also reorder the table of contents for Modeling in H2O so that it breaks into Supervised, Unsupervised, and Misc. Then within each group organize by alphabetical order

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Lauren DiPerna

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Reporter

Lauren DiPerna

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Major