navgix: check for nginx alias traversal vulnerabilities

https://securityonline.info/navgix-check-for-nginx-alias-traversal-vulnerabilities/?expand_article=1

https://twitter.com/home/status/1717798398345011564

https://twitter.com/home/status/1717807907860078650

https://twitter.com/home/status/1717879415118438814