feat: add organisation sso portal (#1946)

Allow organisations to manage an SSO OIDC compliant portal. This method
is intended to streamline the onboarding process and paves the way to
allow organisations to manage their members in a more strict way.

apps/documentation/pages/users/organisations/_meta.json

@@ -3,5 +3,6 @@
   "members": "Members",
   "groups": "Groups",
   "teams": "Teams",
+  "sso": "SSO",
   "billing": "Billing"
-}
+}