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

pages/common/stty.md

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+# stty
+
+> Set options for a terminal device interface.
+
+- Display all settings for the current terminal:
+
+`stty -a`
+
+- Set the number of rows:
+
+`stty rows {{rows}}`
+
+- Set the number of columns:
+
+`stty cols {{cols}}`
+
+- Get the actual transfer speed of a device:
+
+`stty -f {{path/to/device_file}} speed`
+
+- Reset all modes to reasonable values for the current terminal:
+
+`stty sane`