GitLab

Summary:
Update all colab notebooks to:
- Install pytorch3d using pip install from github.
- Retrieve data using `wget`. I set the wget commands to save the files in the same directory structure as in the PyTorch3d repo so that the rest of the tutorial would work for running locally or on Colab.

This should resolve the issues on GitHub with running the colab notebooks.

Reviewed By: gkioxari

Differential Revision: D19827450

fbshipit-source-id: d7b338597ddfd9a84c24592d4dccd274cae11d05