[WIP] docs: standardize docs class table

[dancormier]

This PR attempts to simplify docs markup and unify component docs. This PR only makes changes to stacks-docs.

Doc changes

• Introduces docs-table.html partial to reduce docs page markup clutter and unify table styling
• Standardizes component classes data json
• Standardizes component docs pages by including a Classes block at the start of each page
• Greater use of loops to reduce noisy, difficult to maintain markup

Screenshots

Default style Classes table

Collapsed Classes table

Docs table used for non-classes data

How to test

• View Component doc pages (Avatars, for example) and make sure they render as expected.

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Latest commit: c206dc9

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[giamir]

I have skimmed through the changes and the PR env and everything seems to work fine. I am happy to see this merge without a thorough review since it is just touching the docs.
Thanks @dancormier for this cleanup/improvement.