[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
Isn't it used to store the information of navigation ? Like going into blog/<my_blog>/tag/<my_tag>, choosing a post, then the tag_id is added into parameter, allowing to keep the current search ? I just had a look at the code, I did not try the module itself. Could you have a very carefull look at it ?