sfdisk: add page (#13665)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/linux/sfdisk.md

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+# sfdisk
+
+> Display or manipulate a disk partition table.
+> More information: <https://manned.org/sfdisk>.
+
+- Back up the partition layout to a file:
+
+`sudo sfdisk {{-d|--dump}} {{path/to/device}} > {{path/to/file.dump}}`
+
+- Restore a partition layout:
+
+`sudo sfdisk {{path/to/device}} < {{path/to/file.dump}}`
+
+- Set the type of a partition:
+
+`sfdisk --part-type {{path/to/device}}} {{partition_number}} {{swap}}`
+
+- Delete a partition:
+
+`sfdisk --delete {{path/to/device}} {{partition_number}}`
+
+- Display help:
+
+`sfdisk {{-h|--help}}`