Investigate if we still need `/email` suffix routes for email rendering

These routes render an email formatted version of articles and liveblogs. They are rendered in frontend.

Do we still need them? We can liaise with the newsletters team to find out

Start by locating the frontend routes that handle the /email suffix for articles and liveblogs. Liaise with the newsletters team to establish whether these rendered email versions are still used; done means documenting the decision and, if removal is agreed, identifying the complete route scope for the follow-up change.

Written by the indexing model from the issue text.