website small fixes

Summary: Small website fix.

Reviewed By: bottler

Differential Revision: D20672621

fbshipit-source-id: b787e626f732a8abdd92c29e5e4e8bbe27bc7e2f

Author: nikhilaravi

website/README.md

@@ -59,6 +59,15 @@ This will build the docusaurus website and run a script to parse the tutorials a
 
 TODO: Add support for latex in markdown in jupyter notebooks and embedded images. 
 
+## Build and publish the website
+
+The following script will build the tutorials and the website and push to the gh-pages 
+branch of `github.com/facebookresearch/pytorch3d`.
+
+```
+bash scripts/publish_website.sh
+```
+
 
 ## Add a new tutorial