docs: added center docs and demo

[sarahgm]

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Latest commit: 8f4b9d7

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Name	Status	Preview	Comments	Updated (UTC)
marigold-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2023 9:35am
marigold-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2023 9:35am

[codecov]

Codecov Report

Merging #3157 (8f4b9d7) into main (2f455d8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #3157   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          111       111           
  Lines         6945      6945           
  Branches       316       316           
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  Hits          6945      6945