jj: add operation pages for jj (Jujutsu)

pages/common/jj-operation-log.md

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+# jj operation log
+
+> View log of operations of this jj repository as a graph.
+> Operation ID copied from here can be passed to other commands to run them at that operation.
+> They can also be passed to `jj operation restore` to restore the repository to that state.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-operation-log>.
+
+- Show operation log:
+
+`jj {{[op|operation]}} log`

pages/common/jj-operation-restore.md

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+# jj operation restore
+
+> Restore the repository to an earlier state.
+> `jj operation log` can be used to find the operation ID to be passed here.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-operation-restore>.
+
+- Restore the repository to its state at the given operation:
+
+`jj {{[op|operation]}} restore {{operation}}`

pages/common/jj-operation-show.md

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+# jj operation show
+
+> Show changes to the repository in an operation.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-operation-show>.
+
+- Show changes in an operation:
+
+`jj {{[op|operation]}} show {{operation}}`
+
+- Show stat, summary and patch of modifications of an operation:
+
+`jj {{[op|operation]}} show {{--stat}} {{[-s|--summary]}} {{[-p|--patch]}} {{operation}}`
+

pages/common/jj-operation-undo.md

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+# jj operation undo
+
+> Creates a new operation that undoes an earlier operation.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-operation-undo>.
+
+- Undo the last operation:
+
+`jj {{[op|operation]}} undo`
+
+- Undo the given operation:
+
+`jj {{[op|operation]}} undo {{operation}}`