Remove dnd.js in favour of plain ReasonML Bindings

[rolandpeelen]

📔 Description

Since none of our calls use JSX directly, but only transpiled direct function calls, the dnd.js file added a dependency on an extra transpilation step. Removing it in favour of these bindings removes that. Making for a better UX

📝 Checklist

• All user-facing changes have changelog entries.
• The PR description contains instructions for the reviewer, if necessary.

🎯 Review Instructions

Check if the build runs through / run locally

[dominiklohmann]

Removing deps sounds good. No visible changes afaict.