Add changelog for SSO ux

Author: jhutchings1

src/assets/images/changelog/fundamentals/2025-10-14-sso-configuration-ux.png

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+---
+title: Single sign-on now manageable in the user experience
+description: Cloudflare single sign-on is available for all users, and can be quickly configured in the UX
+products:
+  - fundamentals
+date: 2025-10-14
+---
+
+![Screenshot of new user experience for managing SSO](/assets/images/changelog/fundamentals/2025-10-14-sso-configuration-ux.png)
+
+During Birthday Week, we [announced](https://blog.cloudflare.com/enterprise-grade-features-for-all/) that single sign-on (SSO) is available free to everyone that signs in with a custom email domain and maintains a compatible [identity provider](https://developers.cloudflare.com/cloudflare-one/identity/idp-integration/). SSO minimizes user friction around login, and provides the strongest security posture available. At the time, this could only be configured using the API.
+
+Today, we are launching a new user experience which allows users to manage their SSO configuration from within the Cloudflare dashboard. You can access this by navigating to **Manage account** > **Members** > **Settings**.
+
+