(feat): add 404, 500 page

nginx/default.conf

         index index.html;
         root /var/www/fe;
         try_files $uri $uri/ /index.html;
+        error_page 404 /var/www/fe/404.html;
+        error_page 500 /var/www/fe/500.html;
     }
 
     location /api {