Remove credo and use mix format, and lint everything

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

lib/eventos_web/controllers/user_session_controller.ex

@@ -10,17 +10,22 @@ defmodule EventosWeb.UserSessionController do
     with {:ok, %User{} = user} <- Actors.find_by_email(email),
          {:ok, %User{} = _user} <- User.is_confirmed(user),
          {:ok, token, _claims} <- Actors.authenticate(%{user: user, password: password}) do
-            # Render the token
-            render conn, "token.json", %{token: token, user: user}
+      # Render the token
+      render(conn, "token.json", %{token: token, user: user})
     else
       {:error, :not_found} ->
         conn
         |> put_status(401)
         |> json(%{"error_msg" => "No such user", "display_error" => "session.error.bad_login"})
+
       {:error, :unconfirmed} ->
         conn
         |> put_status(401)
-        |> json(%{"error_msg" => "User is not activated", "display_error" => "session.error.not_activated"})
+        |> json(%{
+          "error_msg" => "User is not activated",
+          "display_error" => "session.error.not_activated"
+        })
+
       {:error, :unauthorized} ->
         conn
         |> put_status(401)