chore: rollup build for react packages

[annawen1]

Contributes to #265

This PR adds the build task for the react packages including a stackblitz example for the react example button. All packages are built in the root of the package with the yarn build command utilizing lerna

The build outputs lib, es, and scss files within each react component package

Changelog

New

• stackblitz example for the React example button component
• rollup config for the react package

Changed

• edit CDN workflows so they work again

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