Use the npm package for the BZVisualizer.js

[dou-du]

We are going to use the npm package "brillouinzone-visualizer" for the BZVisualizer.js file.

[giovannipizzi]

1. Can you also please remove all existing references in the repo to the BZ visualiser, so we are sure we're using the one from NPM and not static versions found here?
2. Can you pin the version of the npm package to a specific version that you tested?
3. Did you try to create the container and check that all works?