This file just appears to be a copy of the wikicode of enwiki templates that PageTriage uses.
However I don't think any code actually calls this page. It's more like a piece of documentation.
The downside of keeping it is that 1) no one is using it, 2) it is slowly getting out of sync with enwiki, and 3) I don't know how to regenerate it.
Am I correct that no PageTriage code loads or uses this page? Any objections to deleting it?
- delete NewPagesFeed_Templates.xml
- update README to not mention NewPagesFeed_Templates.xml