Feature/parceljs

[KevinEtchells]

Context

Using https://parceljs.org/ for building the CSS, JavaScript, and bundling assets. This will give us the following improvements from our current setup:

• Tidying up the /frontend folder
• Ensuring that automatically built files do not get committed
• Preventing manual copying of i.AI Design System assets when doing package updates

Changes proposed in this pull request

• Add Parcel
• Serve assets from the /frontend/dist folder
• Update Readme
• Remove assets that already exist in node packages
• Addnpx parcel build to run as part of the Docker build