Laminar drag & drop demo

This a demo of implementing a drag and drop functionality with Laminar, a Scala.js frontend library.

See demo here: https://laminar-drag-drop.surge.sh/

Dev notes

1. In one terminal run sbt ~fastLinkJS - this will continuously rebuild the Scala.js
   output
2. In another terminal run npm install (only once) and then npm run dev - this will open Vite's preview server, which will automatically reload when you make any changes.