docs: jj-vcs.github.io -> jj-vcs.dev 5b3aa511 parent 0563f4f5

As a follow-up to #8115, this moves all references in the codebase to use the new website. I didn't update the older CHANGELOG entries because I figured they're intended to be immutable.

authored by Steve Klabnik

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To report a security issue, please use the "Report a vulnerability" button on
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GitHub's Security tab for `jj`'s main repo, under
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[Advisories](https://github.com/jj-vcs/jj/security/advisories).
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Our vulnerability management team will respond within 3 working days of your
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report. If the issue is confirmed as a vulnerability, we will open a Security
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Advisory. This project follows a 90 day disclosure timeline.
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Feel free to email Jujutsu VCS Security at <jj-security@googlegroups.com> if you
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have questions.
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