add a nginx rule to rewrite the old yyyy/mm/dd paths to the new /images/ path

templates/nginx.cfg

@@ -14,4 +14,7 @@ server {
         include snippets/fastcgi-php.conf;
         fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
 	}
+
+	# Rewrite the old path yyyy/mm/dd/ to /images/
+	rewrite "^/image/\d{4}/\d{2}/\d{2}/(.+)$" /images/$1 permanent
 }