Consider renaming "author" to "deputy_editor" in `db.json`

[domfarolino]

Per discussion in https://matrixlogs.bakkot.com/WHATWG/2024-04-25 and https://matrixlogs.bakkot.com/WHATWG/2024-04-26, it seems like "author" is really trying to refer to the concept of "deputy editor", referred to in https://whatwg.org/working-mode several times.

Aligning db.json and the script that writes to it (I think that's how it works?) with the prose in Working Mode seems like a good idea to me, to clear up the fact that those listed under the currently-named "author" title are those that actually have real editor-like powers over a given Living Standard.

Does anyone object?

[annevk]

This seems okay to me as an initial improvement. We might want to do more at some point to reconcile terminology across all the WHATWG documents. E.g., we have a rather prominent MAINTAINERS.md file in whatwg/meta.