docs: fix header link to removed website, point to new location

[clintonsteiner]

What does this PR do?

What issues does this PR fix or reference?

Fixes

Previous Behavior

Remove this section if not relevant

New Behavior

Remove this section if not relevant

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• [ X] Docs
• [ X] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• [ X] Tests written/updated

Commits signed with GPG?

Yes

#67068

Please review Salt's Contributing Guide for best practices, including the
PR Guidelines.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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