Return 204 if no favicon is defined to fix CSRF token error on initial page load

docker/nginx/nginx.conf

@@ -30,10 +30,15 @@ http {
         server_name _;
 
         root /var/www/html;
+
         location / {
             try_files $uri $uri/ /index.php$is_args$args;
         }
 
+        location = /favicon.ico {
+            try_files $uri =204;
+        }
+
         location ~ \.php$ {
             fastcgi_split_path_info ^(.+\.php)(/.+)$;
             fastcgi_pass php-fpm:9000;