documentation: switch to pydata theme

[trungleduc]

Issue #, if available:

Description of changes:

Use pydata-sphinx-theme in documentation. This is a widely used theme across the Python ecosystem.

You can try it at https://sagemaker--4220.org.readthedocs.build/en/4220/

Testing done:

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[sagemaker-bot]

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[sagemaker-bot]

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[sagemaker-bot]

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[sagemaker-bot]

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[sagemaker-bot]

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[mufaddal-rohawala]

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[mufaddal-rohawala]

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[mufaddal-rohawala]

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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: bdc4eaa
• Result: FAILED
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[sage-maker]

@trungleduc will you resolve the merge conflicts?