[ADD] website_forum_seo: add new module for improve forum que/ans description


<b>Task:</b> https://www.odoo.com/web#id=9107&view_type=form&model=project.task&menu_id=3942&action=327
<b>Pad:</b> https://pad.odoo.com/p/r.aAXbFLdZvu62soZi


<b>New Module:</b> website_forum_seo
<b>VIew Demo:</b> https://www.youtube.com/watch?v=_lYH_GrRqso

Key argument of sorted can be a function. Here you are using sorted from the std lib. You will have to do: self.search([]).sorted(key=lambda: blabla, reverse=TrueOrFalse).

:param key: either a function of one argument that returns a
                comparison key for each record, or ``None``, in which case
                records are ordered according the default model's order)