fix outstanding things after combining repos

[kfarr]

Things to fix

• dist folder fix dist folder thing #574
• README
• remove legacy folder / package-lock.json inside
• transfer issues from 3dstreet-editor repo into editor
• remove extra .html examples / demos that are out of date
• "ARCHIVE" the 3dstreet-editor repo to make it read only
• remove old json utils

[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.