Remove `examples` from NPM package

Description of the problem

For latest (three@0.119.1) package version examples folder in NPM package is took around 19 mb (mac Finder shows 17.7 mb).

I believe it’s a lot and should not be included in NPM package. Anyone could checkout repo and run any examples it need.

% du -hsx ./node_modules/three/examples | sort -n -r | head -n 10 
 19M    ./node_modules/three/examples

I can create PR.

Three.js version

• r119

Browser

• All of them
• Chrome
• Firefox
• Internet Explorer

OS

• All of them
• Windows
• macOS
• Linux
• Android
• iOS

Hardware Requirements (graphics card, VR Device, …)

[donmccurdy]

It’s worth noting that a significant part of that size is not the source code in examples/js and examples/jsm, but the third-party libraries in examples/js/libs and examples/jsm/libs. The source code may depend on these libraries, though, so it’s still not trivial to delete. Maybe sourcemap support (and removing examples/js) will eventually allow us to not bundle some of those.

[ogonkov]

The reason for this issue way the fact that we save node_modules as artifact in CI workflow, and today it reach limit. I start investigate and found three.js package.

I guess I should rm -rf some parts before archiving it, since it’s not possible to reduce package size the other way.