Move remaining templates from app to server/www

Summary:
- Fix pagination partial
- Move add-to-set template to server/www
- Fix pagination ref in sets/add-to-set.html

Test Plan:
- Load UI
- Check pagination appears
- Check add to set loads

Reviewers: seth, shadowhand

Reviewed By: shadowhand

Differential Revision: https://phabricator.ushahidi.com/D333