This plugin gets used by certain DatoCMS fields to enable the ToastUI Markdown editor instead of the janky default one.
It builds to Vercel (https://vercel.com/fieldmuseum/datocms-plugin-tui-markdown-editor) and then gets iframed by DatoCMS.
Configure in Dato here: https://field-museum.admin.datocms.com/admin/plugins/56122/edit