[ADD] website_banner module

- Task: https://www.odoo.com/web/#id=9562&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.z6vfT0m2KIjzoY3f
Hi @mba-odoo, in website_snippet_editor.js you can pass editable_mode paramater to avoid *if (!self.$target[0].isContentEditable) {* this type of condition and when website page is more with content  than popup needs to scroll to see.