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

pages/common/uname.md

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+# uname
+
+> Print details about the current machine and the operating system running on it.
+> Note: for additional information about the operating system, try the `lsb_release` command.
+
+- Print hardware-related information: machine and processor:
+
+`uname -mp`
+
+- Print software-related information: operating system, release number, and version:
+
+`uname -srv`
+
+- Print the nodename (hostname) of the system:
+
+`uname -n`
+
+- Print all available system information (hardware, software, nodename):
+
+`uname -a`