Add templates for coming soon and maintenance mode

- [x ] I have searched for similar features requests in both open and closed tickets and cannot find a duplicate.
- [ x] The feature is still missing in the latest stable version of Elementor ( Elementor Pro. )

I don't know when this has changed. However, there are no templates for "coming soon" and "maintenance mode" that can be activated from the menu Elementor -> Tools -> Maintenance mode-tab. You have to create them from the ground up now.

Even the Elementor documentation shows (both in writing and on video), that this is working. However, that documentation is outdated, apparently. Templates for maintenance mode and coming soon have moved into the kit library, where they are effectively useless as templates from the kit library cannot be actived through the above-mentioned menu.

Please re-add the templates for maintenance mode and coming soon into the right template category so that we can activate coming soon/maintenance mode without having to create a page from the bottom up first.

Start at Elementor → Tools → Maintenance mode and inspect how the current kit library templates are categorized and exposed there. Compare the behavior with the outdated documentation and video mentioned in the issue. Done means coming soon and maintenance mode templates appear in the correct category and can be activated from that menu.

Written by the indexing model from the issue text.