Move pages under tldr, lint run.sh, update docs

tldr/linux/firejail

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# firejail
+
+> Securely sandboxes processes to containers using built-in Linux capabilities.
+> More information: <https://manned.org/firejail>.
+
+- 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}}`