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 license applies to favicon-96x96.png:
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This work © 2025 by J. Jennings is licensed under Creative Commons Attribution 4.0 International
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This license applies to jj-logo.svg:
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This work © 2025 by J. Jennings and adapted to SVG by Lucas Garron is licensed under Creative Commons Attribution 4.0 International
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