Remove skip_init tutorial

[mikaylagawarecki]

Fixes T237454734

skip_init was originally added to support skipping initialization during load_state_dict, see pytorch/pytorch#29523

This has been superseded by model creation under the meta device context manager and then loading with assign=True, see https://docs.pytorch.org/tutorials/recipes/recipes/module_load_state_dict_tips.html#using-torch-device-meta

So this tutorial can be removed

[pytorch-bot]

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[svekars]

Can you add a redirect to index.html? https://github.com/pytorch/tutorials/blob/main/redirects.py