firejail: add page (#2354)

pages/linux/firejail.md

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+# firejail
+
+> Securely sandboxes processes to containers using built-in Linux capabilities.
+
+- Integrate firejail with your desktop environment:
+
+`sudo firecfg`
+
+- Open a restricted Mozilla Firefox:
+
+`firejail {{firefox}}`
+
+- Start a restricted Apache server on a known interface and address:
+
+`firejail --net={{eth0}} --ip={{192.168.1.244}} {{/etc/init.d/apache2}} {{start}}`
+
+- List running sandboxes:
+
+`firejail --list`
+
+- List network activity from running sandboxes:
+
+`firejail --netstats`
+
+- Shutdown a running sandbox:
+
+`firejail --shutdown={{7777}}`