Email Template Directory For devise_token_auth

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Version: devise_token_auth (1.1.3)

I want to use `app/views/devise_token_auth/*.html.erb` files as email templates if there are any files in the directory.

Because when I want to use both devise and devise_token_auth, this gem use `app/views/devise/mailer/*.html.erb` files as email templates. It causes a problem that confirmation link in confirmation email is always `confirmation_url` even if developers want to another controller like Api::V1::ConfirmationsController.

For example,
devise: Registrations → `app/views/devise/mailer/*.html.erb` → `confirmation_url` in email
DTA: Api::V1::Registrations → `app/views/devise_token_auth/*.html.erb` → `api_v1_confirmation_url` in email

If you have any ideas about this issue, please let me know. Thanks!

### ADDITIONAL

I know that DeviseTokenAuth has config option `DeviseTokenAuth.default_confirm_success_url`, But I was confused when I overwritten email template in `app/views/devise/mailer/*.html.erb`.

Start by tracing how devise_token_auth selects email templates and generates confirmation links, focusing on app/views/devise/mailer/*.html.erb and the proposed app/views/devise_token_auth/*.html.erb path. Confirm how the two mailer flows interact with custom controllers; done means templates in the devise_token_auth directory are used when present without changing the existing Devise flow.

Written by the indexing model from the issue text.