install script fixes

script/install/nginx.danbooru.conf

@@ -1,6 +1,6 @@
 server {
   listen 80;
-  server_name $hostname;
+  server_name HOSTNAME;
   root /var/www/danbooru/public;
   index index.html;
   access_log /var/www/danbooru/log/server.access.log;
@@ -15,7 +15,7 @@ server {
     break;
   }
   location /data {
-    valid_referers none $hostname;
+    valid_referers none HOSTNAME;
     if ($invalid_referer) {
       return 403;
     }
@@ -29,15 +29,6 @@ server {
     rewrite ^(.*)$ /maintenance.html last;
     break;
   }
-  location / {
-    proxy_set_header X-Real-IP $remote_addr;
-    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-    proxy_set_header Host $http_host;
-    proxy_redirect false;
-    if (!-f $request_filename) {
-      proxy_pass http://mongrel;
-    }
-  }
   error_page 404 /404.html;
   error_page 500 502 503 504 /500.html;
 }