coreutils commands: move pages to common/ folder (#2442)

pages/common/pinky.md

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+# pinky
+
+> Print user information using the `finger` protocol.
+
+- Display details about the current user:
+
+`pinky`
+
+- Display details for a specific user:
+
+`pinky {{user}}`
+
+- Display details in the long format:
+
+`pinky {{user}} -l`
+
+- Omit the user's home directory and shell in long format:
+
+`pinky {{user}} -lb`
+
+- Omit the user's project file in long format:
+
+`pinky {{user}} -lh`
+
+- Omit the column headings in short format:
+
+`pinky {{user}} -f`