Move mailer from Bamboo to Swoosh

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/web/email/follow.ex

@@ -2,9 +2,8 @@ defmodule Mobilizon.Web.Email.Follow do
   @moduledoc """
   Handles emails sent about (instance) follow.
   """
-  use Bamboo.Phoenix, view: Mobilizon.Web.EmailView
+  use Phoenix.Swoosh, view: Mobilizon.Web.EmailView
 
-  import Bamboo.Phoenix
   import Mobilizon.Web.Gettext
 
   alias Mobilizon.Users
@@ -57,12 +56,10 @@ defmodule Mobilizon.Web.Email.Follow do
         )
       end
 
-    Email.base_email(to: email, subject: subject)
-    |> assign(:locale, locale)
-    |> assign(:follower, follower)
-    |> assign(:subject, subject)
-    |> render(:instance_follow)
-    |> Email.Mailer.send_email_later()
+    [to: email, subject: subject]
+    |> Email.base_email()
+    |> render_body(:instance_follow, %{locale: locale, follower: follower, subject: subject})
+    |> Email.Mailer.send_email()
 
     :ok
   end