Update to aframe 1.4.2 and latest networked-aframe, remove particles (3.0.x branch)

[vincentfretin]

I completely forgot I already updated the examples on master branch. I resynced the examples in 3.0.x branch from master in https://github.com/networked-aframe/naf-janus-adapter/commit/b9b7f7e1bfabde944b489944b017e1fd1f26089e