🐛 Fix 403 when the frontend has a directory without an index.html (#1094)

frontend/nginx.conf

@@ -4,7 +4,7 @@ server {
   location / {
     root /usr/share/nginx/html;
     index index.html index.htm;
-    try_files $uri $uri/ /index.html =404;
+    try_files $uri /index.html =404;
   }
 
   include /etc/nginx/extra-conf.d/*.conf;