CMS publishes all PRs under Megan's name

## Description

The commits show the logged in user. Possibly this behavior is from the OAuth token used when setting up `git-gateway` (according to Claude).

Perhaps there is a config change to fix this, as the user is correctly authoring the commit, just not the PR.

Another route given that `git-gateway` is depcrecated: https://docs.netlify.com/manage/security/secure-access-to-sites/git-gateway/

Is to add Github as an OAuth provider in Netlify and switch from `git-gateway` to `git` for backend:
```
backend:
name: github
repo: owner/repo
branch: main
```
## Expected Behavior

PR should be authored by the user who made the edits (or by a bot).