Examples: Comment out SSAO demo

[Mugen87]

The current SSAO implementation is broken since a while now, see #8576

Unfortunately, I frequently see people trying to use a SSAO pass in their apps. I think it's better to comment out the example for now.

[mrdoob]

Hmm, but if we hide it it'll never get fixed...

[Mugen87]

Maybe we could add a new issue to track the fix?

I just want to avoid confusion like:

https://discourse.threejs.org/t/three-js-ssao-on-a-smooth-mesh-produces-flat-shaded-results/4805
https://discourse.threejs.org/t/ssao-seems-to-have-no-impact-on-my-scene/2202

[Mugen87]

Okay, I have changed my mind^^. Let me first see if I can revise the shader implementation 😊. I've already managed to fix the depth-of-field and godrays demo, so maybe it will work here, too 😅

[mrdoob]

That'd be great!
This may be a good reference:
http://john-chapman-graphics.blogspot.com/2013/01/ssao-tutorial.html

[mrdoob]

@spite may have some pointers.

[Mugen87]

New PR #15243 🎉