pve-firewall: add page (#7213)

pages/common/pve-firewall.md

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+# pve-firewall
+
+> Manage Proxmox VE Firewall.
+> More information: <https://pve.proxmox.com/wiki/Firewall>.
+
+- Compile and print all firewall rules:
+
+`pve-firewall compile`
+
+- Show information about the local network:
+
+`pve-firewall localnet`
+
+- Restart the Proxmox VE Firewall service:
+
+`pve-firewall restart`
+
+- Start the Proxmox VE Firewall service:
+
+`pve-firewall start`
+
+- Stop the Proxmox VE Firewall service:
+
+`pve-firewall stop`
+
+- Simulate all firewall rules:
+
+`pve-firewall simulate`
+
+- Show the status of Proxmox VE Firewall:
+
+`pve-firewall status`