Links to source in the `File Attachments` section of the `README` are to a non-existent file, `src/fileAttachment.js`. Should they link to `src/fileAttachment.mjs` instead? [Example](https://github.com/observablehq/stdlib/blob/3edd83315db9aa8c3b525c2e4d179f5fa56b17ca/README.md?plain=1#L283) ```markdown [<>](https://github.com/observablehq/stdlib/blob/master/src/fileAttachment.js "Source") ```
