[heavy_tails] update urls for datasets used

[shlff]

Hi @jstac this PR updates the dataset urls used in the lecture heavy_tails after merging the corresponding PR 3 in repo high_dim_data.

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[jstac]

Thanks @shlff . Please let me know when you want me to merge.

[shlff]

Thanks @jstac . I've confirmed that the figures are generated well with the replaced URLs. Please find here:

• https://6452170c5115574d31524dc6--taupe-gaufre-c4e660.netlify.app/heavy_tails.html#heavy-tails-in-economic-cross-sections

This PR is ready for review.

[Smit-create]

Thanks @shlff. @jstac, Should we merge this and try to rebase #192 on top of this?

[jstac]

Thanks @shlff , @Smit-create . Merging.