Fix Credo Readability (strict)

- Max line length, implicit try, alias order, zero-arity defs
- String sigils, long comments split; redundant blank lines fixed

test/mv_web/live/group_live/index_test.exs

@@ -13,8 +13,8 @@ defmodule MvWeb.GroupLive.IndexTest do
   import Phoenix.LiveViewTest
   use Gettext, backend: MvWeb.Gettext
 
-  alias Mv.Membership
   alias Mv.Fixtures
+  alias Mv.Membership
 
   describe "mount and display" do
     test "page renders successfully for admin user", %{conn: conn} do