jj-operation: add pages (#17045)

pages/common/jj-operation.md

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+# jj operation
+
+> Work with the operation log of a `jj` repository.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-operation>.
+
+- Show operation log:
+
+`jj {{[op|operation]}} log`
+
+- Undo the last operation:
+
+`jj {{[op|operation]}} undo`
+
+- Undo a given operation:
+
+`jj {{[op|operation]}} undo {{operation}}`
+
+- Restore the repository to its state at a given operation:
+
+`jj {{[op|operation]}} restore {{operation}}`
+
+- Show changes to the repository 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}}`