arptables: add page (#16197)

* arptables: add page

* arptables: update link to comply with man page link policy

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* arptables: use option placeholder for list example

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* arptables: update append rule example

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/linux/arptables.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/linux/arptables.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/linux/arptables.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/linux/arptables.md

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

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Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/linux/arptables.md

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+# arptables
+
+> Manage ARP filtering rules using the `nftables` backend.
+> Part of the `xtables-nft` suite for ARP packet filtering.
+> More information: <https://manned.org/arptables>.
+
+- List all ARP rules in the filter table:
+
+`sudo arptables {{[-L|--list]}}`
+
+- Append a rule to drop ARP packets from a specific IP address:
+
+`sudo arptables {{[-A|--append]}} INPUT {{[-s|--source-ip]}} {{192.168.0.1}} {{[-j|--jump]}} DROP`
+
+- Delete a specific rule from the INPUT chain by its rule number:
+
+`sudo arptables {{[-D|--delete]}} INPUT {{rule_number}}`
+
+- Flush all rules in the filter table:
+
+`sudo arptables {{[-F|--flush]}}`
+
+- Set the default policy of the OUTPUT chain to ACCEPT:
+
+`sudo arptables {{[-P|--policy]}} OUTPUT ACCEPT`
+
+- Save the current ARP rules to a file:
+
+`sudo arptables-save > {{path/to/file}}`