[IMP] website, website_crm, website_hr_recruitment: remove useless name field from website.page

Before this commit, website.page had a 'name' field which was useless because
website.page inheritS from ir.ui.view which has its own 'name field.
At the end, we were duplicating/synchronizing 'name' field between
website.page and its ir.ui.view for no reason because we were always using the
one from ir.ui.view.

Now, getting website.page's name will always retrieve the one from its
ir.ui.view and there is no redundant information.