[IMP] event : Update tour message, clean onboarding and some views

Change event onboarding rainbow message to something more relevant. Default
message is considered as less user friendly than the new one.

Before this commit the category_id for a tag had no label displayed. We choose
to wrap the category_id field inside a group so that field labels shows up.

In settings, wrap the tag_ids inside a div.o_setting_right_pane so we can have
the left border displayed correctly, like most fields in settings.

Finally remove "Online" template from the event_data since it acts like a
dummy type without pre-defined data.

Task 2257884

closes odoo/odoo#52472

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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