[MIG] website_blog: new api migration

- Task: https://www.odoo.com/web?debug=#id=9783&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.gSXNQBNaLZL5Ausm
Quite ugly. Please make ranking a stored field depending on number of visits. It will be recomputed every time it is viewed; probably we could have a better algorithm but at least we should be able to search and order on ranking.