Project website is down

The home page / demo page for this project is down: http://headless-cms-yaml-input.vercel.app/

Console reveals client-side exceptions e.g. `Error: Unrecognized extension value in extension set ([object Object]). This sometimes happens because multiple instances of @codemirror/state are loaded, breaking instanceof checks.`

Open the home or demo page at http://headless-cms-yaml-input.vercel.app/ and reproduce the client-side exception shown in the console. Trace the @codemirror/state extension error through the project setup; done means the website loads and the console no longer reports this failure.

Written by the indexing model from the issue text.