public async Task <IActionResult> Index()
        {
            using (var deckDao = new DeckDao(DbContext))
            {
                var deckExists = await deckDao.CheckDecksExistance();

                if (deckExists)
                {
                    return(RedirectToAction("", "Decks"));
                }
                else
                {
                    return(RedirectToAction("", "Deck"));
                }
            }
        }