Standalone npm React component

[tcr]

edit-text is designed to target a central server but all client side editing functions work without a server connection. Having a rich text editor component that could be pulled into any React app would:

• Enforce better encapsulation of the editor code
• Give an option for drop-in WYSIWYG markdown editing in React code, with strong guarantees of your document being well-formed
• Improve independently testing the editor

This might use wasm-pack or might be able to just be generated from the edit-frontend module directly.