Updated instructions for downloading the documentation

Author: chaitanyarahalkar

assets/stylesheets/pages/_threejs.scss

@@ -291,9 +291,14 @@ curl https://sqlite.org/2022/sqlite-doc-3400000.zip | bsdtar --extract --file -
 ```
 
 ## Three.js
+Download the docs from https://github.com/mrdoob/three.js/tree/dev/files or run the following commands in your terminal:
+Make sure to set the version per the release tag (e.g. r160). Note that the r prefix is already included, only the version number is needed.
 
 ```sh
-git clone --depth 1 --branch r${VERSION} https://github.com/mrdoob/three.js.git
-mv three.js/docs/ docs/threejs~${VERSION}/
-rm -rf three.js/
+curl https://codeload.github.com/mrdoob/three.js/tar.gz/refs/tags/r${VERSION} > threejs.tar.gz
+tar -xzf threejs.tar.gz
+mkdir -p docs/threejs~${VERSION}
+mv three.js-r${VERSION}/docs/* docs/threejs~${VERSION}/
+rm -rf three.js-r${VERSION}/
+rm threejs.tar.gz
 ```