Link to NVIDIA docker base image leads to deprecated repository

[mickeybeurskens]

This link in the documentation currently points to a deprecated repository by NVIDIA. Is this still accurate?

cog/docs/getting-started-own-model.md

Line 147 in 3517511

Cog will use the [nvidia-docker](https://github.com/NVIDIA/nvidia-docker) base image and automatically figure out what versions of CUDA and cuDNN to use based on the version of Python, PyTorch, and Tensorflow that you are using.