Revert "MT#5389 add nginx config for deb.kamailio.org"
Revert "MT#5389 add nginx config for deb.kamailio.org"

This reverts commit 9de788effbad0f48b410b6a5b14b7dc1f6fa69a0.

Fails with:

| Reloading nginx configuration: nginx: [emerg] duplicate listen options for [::]:80 in /etc/nginx/sites-enabled/default:20
| nginx: configuration file /etc/nginx/nginx.conf test failed

sipwise/kamailio-deb-jenkins,sipwise/kamailio-deb-jenkins