Add changelog for SSO UX

[jhutchings1]

Summary

Adds a changelog for the SSO UX feature launch.

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/assets/images/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing

[patriciasantaana]

Might be better to say the dash instead of 'user experience'?

Suggested change

	title: Single sign-on now manageable in the user experience
	title: Single sign-on is now manageable in the Cloudflare dashboard

[github-actions]

Preview URL: https://c38a6cbf.preview.developers.cloudflare.com
Preview Branch URL: https://jhutchings1-sso-changelog.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/2025-10-14-sso-self-service-ux/	https://jhutchings1-sso-changelog.preview.developers.cloudflare.com/changelog/2025-10-14-sso-self-service-ux/