[CHORE] forecast link

[deven367]

This PR fixes the redirects for the forecast.html page

[review-notebook-app]

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[elessar-for-github]

Changes made by this pull request:

nbs/docs/how-to-guides/cross_validation.ipynb
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nbs/docs/how-to-guides/transfer_learning.ipynb
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nbs/docs/tutorials/electricity_load_forecasting.ipynb
[Error processing diff]

nbs/docs/tutorials/prediction_intervals_in_forecasting_models.ipynb
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[codspeed-hq]

Merging this PR will not alter performance

✅ 12 untouched benchmarks

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_{Comparing forecast-link (d842000) with main (8c314af)}