Remove deprecated NGINX CI config

lib/support/nginx/gitlab_ci

-# GITLAB CI
-server {
-  listen 80 default_server;         # e.g., listen 192.168.1.1:80;
-  server_name YOUR_CI_SERVER_FQDN;  # e.g., server_name source.example.com;
-
-  access_log  /var/log/nginx/gitlab_ci_access.log;
-  error_log   /var/log/nginx/gitlab_ci_error.log;
-
-  # expose API to fix runners
-  location /api {
-    proxy_read_timeout    300;
-    proxy_connect_timeout 300;
-    proxy_redirect        off;
-    proxy_set_header      X-Real-IP $remote_addr;
-
-    # You need to specify your DNS servers that are able to resolve YOUR_GITLAB_SERVER_FQDN
-    resolver 8.8.8.8 8.8.4.4;
-    proxy_pass $scheme://YOUR_GITLAB_SERVER_FQDN/ci$request_uri;
-  }
-
-  # redirect all other CI requests
-  location / {
-    return 301 $scheme://YOUR_GITLAB_SERVER_FQDN/ci$request_uri;
-  }
-
-  # adjust this to match the largest build log your runners might submit,
-  # set to 0 to disable limit
-  client_max_body_size 10m;
-}
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