fix: kratos quickstart

[vinckr]

closes #2511

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact security@ory.com) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

[Copilot]

Pull request overview

This PR updates the Ory Kratos quickstart documentation to better reflect current self-service flow payloads and the registration/verification + recovery UX, including refreshed example responses and an updated screenshot.

Changes:

• Updates narrative around session/login/registration and expands the MailSlurper-based email verification guidance.
• Refreshes example curl/JSON responses for login, registration, and session details to match newer Kratos payload shapes.
• Rewords the account recovery section to reflect one-time-code based recovery, and updates the password-policy screenshot asset.

Reviewed changes

Copilot reviewed 1 out of 9 changed files in this pull request and generated 4 comments.

File	Description
docs/kratos/quickstart.mdx	Updates quickstart text and example payloads for login/registration/session, revises verification + recovery guidance.
docs/kratos/_static/quickstart/secureapp-registration-pwpolicy.png	Replaces the password policy screenshot used by the quickstart.

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