This change has landed in Tutor-MFE Nightly , and it will be part of Tutor-MFE v19 (Sumac). HTTP 301 redirects are provided as to keep backwards compatibility with /course-authoring/ URLs.
Frontend developers who bind-mount the authoring MFE: If your tutor-mfe checkout is older than this this commit, then the folder must be named frontend-app-course-authoring. If it newer then that commit, then the folder must be named frontend-app-authoring. When switching from one repo name to the other, un-mount the folder and then re-mount it:
tutor mounts remove path/to/frontend-app-course-authoring
mv path/to/frontend-app-course-authoring path/to/frontend-app-authoring
tutor mounts add path/to/frontend-app-authoring