fix import path in demo

[beenotung]

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To allow importing without the dist directory, you may publish the dist directory to npm (instead of the root directory). If using this approach, you will need to update the "main" and "typings"/"types" field in the package.json (and copy the package.json to the dist folder, and cd to that folder before running "npm publish")

[beenotung]

You may take reference on https://www.npmjs.com/package/mk-package