git-replace, w: add pages

pages/common/git-replace.md

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+# git replace
+
+> Create, list, delete refs to replace objects.
+> More information: <https://linux.die.net/man/1/git-replace>.
+
+- Replace any commit with a different one, rest commits unchanged:
+
+`git replace {{object}} {{replacement}}`
+
+- Delete existing replace refs for the given objects:
+
+`git replace --delete {{object}}`
+
+- Edit an object’s content interactively:
+
+`git replace --edit {{object}}`