Add initial Voxels documentation for javascript3d

[doppl3r]

The javascript3d documentations are missing the new Voxels documentation. Listed below are the new additions:

• static/javascript3d/classes/Voxels.html
• static/javascript3d/enums/ShapeType.html
• static/javascript3d/index.html

[doppl3r]

@Vrixyz is there anything else I need to include in order to get this PR merged?

[ThierryBerger]

Publishing website is still bottlenecked by manual action, so until we have a better story for automatic publishing, this PR hasn't got much priority (I'll bump it up when a website release comes around 🤞).

That being said, It looks good to me, I'm leaving an approval...

In the future, this kind of PR will likely have to be accompanied by a version bump (from #141) ; but no action is needed here because linked PR is WIP and not conflicting.

[ThierryBerger]

Thanks again for the heads up, this documentation update is done mostly through script, so accepting a user PR is difficult to vouch for ; I started the same objective in #142 ; with a more holistic approach (2d + 3d, whole API)

[ThierryBerger]

Closing this in favor of #142 ; thanks again for the reminder though!