feat(storybook): Reimplement "Themes" add on with React95 style

[WesSouza]

This also pins storybook to 6.5.9 and removes storybook-addon-styled-component-theme.

I tried upgrading storybook to 6.5.10 and something broke, so I'm temporarily pinning it to 6.5.9 until we can figure out the issue.

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Name	Status	Preview	Updated
react95	✅ Ready (Inspect)	Visit Preview	Aug 4, 2022 at 7:48PM (UTC)

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:tada: This PR is included in version 4.0.0-beta.11 :tada:

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:tada: This PR is included in version 4.0.0 :tada:

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