feat: document how to customize redirect url

[aeneasr]

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.
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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

[vinckr]

awesome!

[aeneasr]

@vinckr can you please try if it works? :D

[vinckr]

I can confirm that it works.

Very important to match the URI everywhere!

stale