conntrack: add page (#8081)

* conntrack: add page

* Update pages/linux/conntrack.md

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>

Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>

pages/linux/conntrack.md

@@ -0,0 +1,25 @@
+# conntrack
+
+> Interact with the Netfilter connection tracking system.
+> Search, list, inspect, modify, and delete connection flows.
+> More information: <https://manned.org/conntrack>.
+
+- List all currently tracked connections:
+
+`conntrack --dump`
+
+- Display a real-time event log of connection changes:
+
+`conntrack --event`
+
+- Display a real-time event log of connection changes and associated timestamps:
+
+`conntrack --event -o timestamp`
+
+- Display a real-time event log of connection changes for a specific IP address:
+
+`conntrack --event --orig-src {{ip_address}}`
+
+- Delete all flows for a specific source IP address:
+
+`conntrack --delete --orig-src {{ip_address}}`