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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# This is the list of Jujutsu's significant contributors.
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#
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# This does not necessarily list everyone who has contributed code,
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# especially since many employees of one corporation may be contributing.
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# To see the full list of contributors, see the revision history in
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# source control.
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Google LLC
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