fix dist folder thing

[kfarr]

From @vincentfretin:

For dist folder, meaning copying files from public folder to dist and deploying dist to firebase and as well make index.html a resource handled by webpack so the url to dist files are versioned will allow to lazy load react components and libraries. Some work was done in 3DStreet/3dstreet-editor#358 but was probably blocked by the webpack config at the time.

[vincentfretin]

new PR is #557