Increase wiki file upload size limit

site-cookbooks/kosmos-mediawiki/templates/default/nginx.conf.erb

@@ -12,6 +12,8 @@ server {
         root <%= @docroot %>;
         index index.php;
 
+        client_max_body_size 20M;
+
         location / {
                 try_files $uri $uri/ /index.php?$args;
         }