ufw-{default,delete}: add page (#23730)

Co-authored-by: Wiktor Perskawiec <wiktor@perskawiec.cc>

Author: canonnizq

pages/linux/ufw-default.md

@@ -0,0 +1,16 @@
+# ufw default
+
+> Change the default policy for traffic based on direction.
+> More information: <https://manned.org/ufw>.
+
+- Allow traffic going a certain direction:
+
+`sudo ufw default allow {{incoming|outgoing|routed}}`
+
+- Deny traffic going a certain direction:
+
+`sudo ufw default deny {{incoming|outgoing|routed}}`
+
+- Reject traffic going a certain direction:
+
+`sudo ufw default reject {{incoming|outgoing|routed}}`

pages/linux/ufw-delete.md

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+# ufw delete
+
+> Delete firewall rules.
+> More information: <https://manned.org/ufw>.
+
+- Delete an exact matching rule:
+
+`sudo ufw delete {{rule}}`
+
+- Delete a rule by its rule number:
+
+`sudo ufw delete {{number}}`