add Vanta docs to integration index (#6284)

Author: souredoutlook

src/docs/product/integrations/index.mdx

@@ -19,6 +19,14 @@ Sentry’s integration platform provides a way for external services to interact
 
 For more details, see the [full Integration Platform documentation](/product/integrations/integration-platform/).
 
+## Compliance
+
+| Integration                                                      | API |
+| ---------------------------------------------------------------- | --- |
+| [Vanta](https://help.vanta.com/hc/en-us/articles/13045851267092) | X   |
+
+
+
 ## Notification & Incidents
 
 | Integration                                                              | Issue alerts | Metric alerts | Link Unfurling |