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

[kfarr]

note -- just ran into a related issue again while testing on https://dev-3dstreet.web.app

• the old build was cached in my browser, had to use network tools to break the cache and see the updated version

instead the improved dist method will have cachebusting for each deploy?

[vincentfretin]

That's right.