remove ootb dash docs (#29249)

Co-authored-by: drichards-87 <deforest.richards@datadoghq.com>

Author: roxanne-moslehi

content/en/service_management/service_level_objectives/_index.md

@@ -5,6 +5,7 @@ aliases:
 - /monitors/monitor_uptime_widget/
 - /monitors/slos/
 - /monitors/service_level_objectives/
+- /service_management/service_level_objectives/ootb_dashboard
 further_reading:
 - link: "https://www.datadoghq.com/blog/slo-monitoring-tracking/"
   tag: "Blog"