Before this commit, the calendar UX was not good enough. The look and feel was not modern.
This commit improves a lot of small details, remove unneeded or not mature features (like the videocall location url).
Counted recurrence now brings a better experience. When weekly or montly recurrences are created, occurences in the past are dismissed but before this commit their number was not adapted.
User would end up with less occurences than the provided number without explanations.
Taskid: 2484335
Part-of: odoo/odoo#68700
Arnaud Joset
40fd44f618