refactor(auth): replace myth/auth with codeigniter/shield + define new roles

.devcontainer/devcontainer.json

app/Common.php

app/Config/Email.php

app/Config/Events.php

app/Config/Filters.php

app/Config/Routes.php

app/Config/Security.php

app/Config/Validation.php

app/Controllers/ActorController.php

app/Controllers/BaseController.php

app/Controllers/CreditsController.php

app/Controllers/EpisodeCommentController.php

app/Controllers/EpisodeController.php

app/Controllers/HomeController.php

app/Controllers/MapController.php

app/Controllers/PageController.php

app/Controllers/PodcastController.php

app/Controllers/PostController.php

app/Database/Migrations/2021-05-29-120000_add_media.php

app/Database/Migrations/2021-05-29-152000_add_categories.php