chore: add Flipt as OPA integrator

docs/website/content/integrations/flipt.md

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+---
+title: Flipt
+subtitle: CloudNative Feature Flag Management
+labels:
+  layer: application
+  category: Feature Flags
+software:
+- golang
+- oidc
+inventors:
+- flipt
+code:
+- https://github.com/flipt-io/flipt
+tutorials:
+- https://docs.flipt.io/authorization/overview
+- https://docs.flipt.io/guides/operation/authorization/rbac-with-keycloak
+- https://docs.flipt.io/configuration/authorization
+docs_features:
+  go-integration:
+    note: |
+      Flipt's authorization feature uses the Go API to embed Open Policy Agent and evaluate authorization policies.
+      [These docs](https://docs.flipt.io/authorization/overview)
+      explain how it works.
+---
+Flipt is an open-source, Enterprise-ready, GitOps enabled, CloudNative feature management solution.

docs/website/content/organizations/flipt.md

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+---
+link: https://www.flipt.io/
+title: Flipt
+---