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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edition = "2024"
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max_width = 100
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wrap_comments = true
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format_strings = true
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error_on_line_overflow = true
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group_imports = "StdExternalCrate"
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imports_granularity = "Item"
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