docs: add security preset page and opentelemetry to sidebar (#24592)

docs/usage/.pages

@@ -42,6 +42,7 @@ nav:
       - 'Regex Manager Presets': 'presets-regexManagers.md'
       - 'Replacement Presets': 'presets-replacements.md'
       - 'Schedule Presets': 'presets-schedule.md'
+      - 'Security Presets': 'security-schedule.md'
       - 'Workaround Presets': 'presets-workarounds.md'
   - All Other:
       - ... | user-stories

docs/usage/getting-started/.pages

@@ -5,3 +5,4 @@ nav:
   - 'Self-Hosting Examples': '/examples/self-hosting'
   - 'Installing & Onboarding': 'installing-onboarding.md'
   - 'Private Packages': 'private-packages.md'
+  - 'Observability': '/opentelemetry'