[blog] Implement RSS Feeds

- Task: https://www.odoo.com/web?debug#id=9547&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.SIeozbGyEfAhkzKO
I was asking the purpose of this line and why you don't deal with RSS here ? Does that mean that an RSS feed will get an atom link ?