docs(): add styles for sphinx generated python docs

[jeffmerrick]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
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[hsheth2]

@jeffmerrick looks awesome overall!

A few minor tweaks

1. In this one, the extra spacing between in the parameters section looks a bit strange

2. The formatting of these types still looks a bit clunky and hard to read. Could we make primitive types like Union, str, Optional not have such heavy formatting around them?

[jeffmerrick]

@hsheth2 Definitely - made those tweaks:

[jeffmerrick]

@hsheth2 Updated the container style: