[IMP]Website Blog: Make Onboarding tour user friendly and change customi...

...ze cover feature

- Task: https://www.odoo.com/web?debug=#id=8996&view_type=form&model=project.task&menu_id=3942&action=327
- Pad: https://pad.odoo.com/p/r.MnhQk73bZbMtu2Mv
@tde-banana-odoo 
Default value is not sufficient because we want this field as placeholder in frontend ,if we not set 
                           'name'="",
Then "t-field" used to render "name" will take default vaule and it not act like placeholder.