feat: settings and welcome page should support logout return_to

[Benehiko]

Related Issue or Design Document

https://github.com/ory-corp/cloud/issues/3524

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.
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• I have added tests that prove my fix is effective or that my feature works.
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Further comments

[Benehiko]

I've tested this manually, will add some e2e tests for this in Kratos as well