Deprecate nato_stanag

[matthew-kersting]

The crawler nato_stanag in nato_spider.py is no longer active or needed. This PR deprecates this spider by moving it to the unfinished directory and removing it from the Friday crawler list.

I also ran the following SQL command to take a backup

SELECT * FROM public.crawler_status WHERE crawler_name = 'nato_stanag' ORDER BY datetime DESC;

before executing this command on the dev postrges database to delete all the relevant crawler_status updates

DELETE FROM public.crawler_status WHERE crawler_name = 'nato_stanag';