MeshToonMaterial: Removed shininess and specular/specularMap

[mrdoob]

As discussed in #16257

We can add them back whenever we render them correctly. The way its being rendered now it's confusing.

Also updated the example.

Before:

After:

[WestLangley]

This does not look right for a toon shader.

Given that you want to support lights, I suggest simply replacing the directional light in this example with an ambient light.

var ambientLight = new THREE.AmbientLight( 0xffffff, 0.2 );
scene.add( ambientLight );

[mrdoob]

Sounds good to me 👌