modules/mail: Move the user config away from the module

That change also does two other things:
        - soispha@vhack.eu now gets all the admin email
                That is just so, because it avoids adding another
                `all_admins` option, and we realistically don't get
                these email either. So I think that is just easier.
        - The acme creds are now generated via a `nginx.localhost`
                That means, that something (i.e. nginx) is actually
                responding, when you perform a GET request against the
                email domain. That helps for the ACME http challenges.
                No idea, how these worked before.

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