Now that we have deployed the new NewPagesFeed implementation, using vue.js, we can remove the old unusued code.
Note the folder changes in T342323 which may help localise the code requiring removal.
* [x] move images from `modules/ext.pageTriage.views.newPagesFeed/images/` to `modules/ext.pageTriage.newPagesFeed.vue/images/` (or similar), and update all places these images are referenced ([[https://gerrit.wikimedia.org/r/c/973426 | gerrit:973426]])
* [ ] remove feature flag `pagetriage_ui` ([[https://gerrit.wikimedia.org/r/c/mediawiki/extensions/PageTriage/+/990372 | gerrit:990372]])
* [ ] delete `modules/ext.pageTriage.views.newPagesFeed/`([[https://gerrit.wikimedia.org/r/c/mediawiki/extensions/PageTriage/+/990373 | gerrit:990373]])
* [ ] rename `modules/ext.pageTriage.newPagesFeed.vue/` to `modules/ext.pageTriage.newPagesFeed/` (no .vue), and update all places these paths are referenced
* [ ] test and make sure nothing is broken