[nginx/statping] Drop old statping configuration

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/statping/templates/nginx/sites-available/status.j2

-{{ ansible_header | comment }}
-
-server {
-    listen 80;
-    listen [::]:80;
-    server_name status.crans.org;
-
-    access_log /var/log/nginx/status.log combined;
-    error_log /var/log/nginx/status.error.log;
-
-    location / {
-        proxy_pass http://127.0.0.1:8080;
-        proxy_redirect off;
-    }
-}