remove ora nginx site

playbooks/roles/nginx/templates/edx/app/nginx/sites-available/ora.j2

-upstream app_server {
-    {% for host in nginx_ora_gunicorn_hosts %}
-        server {{ host }}:{{ ora_gunicorn_port }} fail_timeout=0;
-    {% endfor %}
-}
-
-server {
-  listen {{ ORA_NGINX_PORT }} default_server;
-
-  location / {
-
-    {% include "basic-auth.j2" %}
-    try_files $uri @proxy_to_app;
-  }
-
-  # Check security on this
-  location /static/ {
-    alias /opt/wwc/staticfiles/;
-
-    # return a 403 for static files that shouldn't be
-    # in the staticfiles directory
-    location ~ ^/static/(.*)(\.xml|\.json|README.TXT) {
-        return 403;
-    }
-    # Set django-pipelined files to maximum cache time
-    location ~ /static/.*\.[0-9a-f]+\..* {
-        expires max;
-    }
-
-    # Expire other static files immediately (there should be very few / none of these)
-    expires epoch;
-  }
-
-  {% include "robots.j2" %}
-
-  location @proxy_to_app {
-    client_max_body_size 75K;
-    proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
-    proxy_set_header X-Forwarded-Port $http_x_forwarded_port;
-    proxy_set_header X-Forwarded-For $http_x_forwarded_for;
-    proxy_set_header Host $http_host;
-
-    proxy_redirect off;
-    proxy_pass http://app_server;
-  }
-}