Chore: remove orphaned dev portal RBAC topic

[lena-larionova]

Description

The old Konnect dev portal RBAC topic still exists in the Konnect docs and shows up in search: https://docs.konghq.com/konnect/api/portal-auth/portal-rbac-guide/. It was replaced by https://docs.konghq.com/konnect/dev-portal/access-and-approval/manage-teams/#enable-portal-rbac but never deleted.

Testing instructions

Preview link: https://deploy-preview-7961--kongdocs.netlify.app/konnect/api/portal-auth/portal-rbac-guide/ redirects to the new page.

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

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