Artifacts TTL example

[TankofVines]

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The following colabs were changed
-colabs/wandb-artifacts/WandB_Artifacts_Time_to_live_TTL_Walkthrough.ipynb

[tcapelle]

Do we really need the kaggle part? can we just pull a dataset from torchvision/datasets?
This way is more maintainable; right now, this notebook can only be run by the author.

[noaleetz]

lgtm!!!!!