apt-clone: add page (#13901)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/linux/apt-clone.md

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+# apt-clone
+
+> Clone/backup/restore the package state of a Debian-based system.
+> More information: <https://github.com/mvo5/apt-clone>.
+
+- Clone the package state of the current system into a specified directory:
+
+`apt-clone clone {{path/to/directory}}`
+
+- Create a clone file (`tar.gz`) for backup purposes:
+
+`apt-clone clone --destination {{path/to/backup.tar.gz}}`
+
+- Restore the package state from a clone file:
+
+`apt-clone restore {{path/to/backup.tar.gz}}`
+
+- Show information about a clone file (e.g., the release, architecture):
+
+`apt-clone info {{path/to/backup.tar.gz}}`
+
+- Check if the clone file can be restored on the current system:
+
+`apt-clone restore {{path/to/backup.tar.gz}} --destination {{path/to/restore}}`