[WIP] experiment with big mac dataset

[alexfauquette]

The scatter chart page is super sad. Addin a bit of real world data could make it a bit more enjoyable

The data set could also be used as a demo in line chart with 1 series par country to show it's evolution along the years

For now just experimentation base on an idea I had during holidays :)

[mui-bot]

Deploy preview: https://deploy-preview-13128--material-ui-x.netlify.app/

Updated pages:

• docs/data/charts/scatter/scatter.md

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