Update vista3d tutorial readme

[heyufan1995]

Fixes #1856.

Description

A few sentences describing the changes proposed in this pull request.

Checks

• Avoid including large-size files in the PR.
• Clean up long text outputs from code cells in the notebook.
• For security purposes, please check the contents and remove any sensitive info such as user names and private key.
• Ensure (1) hyperlinks and markdown anchors are working (2) use relative paths for tutorial repo files (3) put figure and graphs in the ./figure folder
• Notebook runs automatically ./runner.sh -t <path to .ipynb file>

[KumoLiu]

I used the link for the weights in the model-zoo instead of google-drive. If that's not expected please raise it to me. Thanks.