website/docs: finalise 2025.10 release notes (cherry-pick #17728 to version-2025.10) (#17733)

website/docs: finalise 2025.10 release notes (#17728)

* website/docs: finalise 2025.10 release notes



* format



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Signed-off-by: Jens Langhammer <jens@goauthentik.io>
Co-authored-by: Jens L. <jens@goauthentik.io>

Author: authentik-automation[bot]