Replace mailing list by discuss

[ced (Cédric Krier)]

@pokoli

we should add a notice on the first page

Already in Welcome to Discourse

@pokoli

Idem about the notice.

I like to make this the most inclusive possible so we should make a clear statement on the first page.

I do not follow here. I think this “localization” topic only exists wrongly in the mind of old integrators.
Also I do not see which statement could be made. “You can talk about any localization of Tryton”. Why would we make a special mention about this and not all other topics?