jj, jj-diff, jj-log, jj-status: add pages (#17041)

pages/common/jj-diff.md

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+# jj diff
+
+> Compare file contents between two revisions.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-diff>.
+
+- Show changes of current revision:
+
+`jj diff`
+
+- Show changes of given revsets (e.g. `B::D`, `A..D`, `B|C|D`, etc.):
+
+`jj diff {{[-r|--revisions]}} {{revsets}}`
+
+- Show changes from given revision to given revision:
+
+`jj diff {{[-f|--from]}} {{from_revset}} {{[-t|--to]}} {{to_revset}}`
+
+- Show diff statistics:
+
+`jj diff --stat`
+
+- Show a Git-format diff:
+
+`jj diff --git`

pages/common/jj-log.md

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+# jj log
+
+> Show revision history as a graph.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-log>.
+
+- Show revision history as a graph:
+
+`jj log`
+
+- Show only given revsets (e.g. `B::D`, `A..D`, `B|C|D`, etc.):
+
+`jj log {{[-r|--revisions]}} {{revsets}}`
+
+- Show log with a particular template for each line (e.g. 5 characters of commit hash and author):
+
+`jj log {{[-T|--template]}} 'commit_id.shortest(5) ++ " " ++ author'`

pages/common/jj-status.md

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+# jj status
+
+> Show high-level repository status.
+> This includes the working copy commit and its parents, and a summary of the changes in the working copy and any existing conflicts in the working copy.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-status>.
+
+- Show high-level status of the repository:
+
+`jj status`

pages/common/jj.md

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+# jj
+
+> Jujutsu, a version control system.
+> Some subcommands such as `log`, `desc`, `new`, `git`, etc. have their own usage documentation.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/>.
+
+- Update description of the revisions specified by given revsets (e.g. `B::D`, `A..D`, `B|C|D`, etc.):
+
+`jj describe {{[-r|--revision]}} {{revsets}}`
+
+- Create a new commit/revision on top of a given revision :
+
+`jj new {{revset}}`
+
+- Create a new merge commit on top of multiple revisions:
+
+`jj new {{revset1 revset2 ...}}`
+
+- Execute a jj subcommand without snapshotting the working copy:
+
+`jj --ignore-working-copy {{subcommand}}`
+
+- Execute a jj subcommand at an operation:
+
+`jj {{[--at-op|--at-operation]}} {{operation}} {{subcommand}}`
+
+- Display help for a specific subcommand (like `new`, `commit`, `desc`, etc.):
+
+`jj help {{subcommand}}`