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

pages/common/dd.md

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+# dd
+
+> Convert and copy a file.
+
+- Make a bootable usb drive from an isohybrid file (such like archlinux-xxx.iso) and show the progress:
+
+`dd if={{file.iso}} of=/dev/{{usb_drive}} status=progress`
+
+- Clone a drive to another drive with 4MB block, ignore error and show progress:
+
+`dd if=/dev/{{source_drive}} of=/dev/{{dest_drive}} bs=4M conv=noerror status=progress`
+
+- Generate a file of 100 random bytes by using kernel random driver:
+
+`dd if=/dev/urandom of={{random_file}} bs=100 count=1`
+
+- Benchmark the write performance of a disk:
+
+`dd if=/dev/zero of={{file_1GB}} bs=1024 count=1000000`
+
+- Check progress of an ongoing dd operation (Run this command from another shell):
+
+`kill -USR1 $(pgrep ^dd)`