docs: add playground

[tmlmt]

Description

Adds a playground to the package that can be deployed to easily test out the latest version of the parser.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[tmlmt]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• docs: add playground #82 👈 (View in Graphite)
• feat!: alternative units and ingredients #80
• ci(release): publish release with pre-release tag for pre-release version numbers #86
• docs: generate and deploy for both v2 and v3 #85
• chore: remove patched version of human-regex use new v2.2.0 instead #84
• feat: new class ShoppingCart to assing ingredients in a shopping list to products from a catalog #83
• main

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