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

tldr/linux/ufw

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ufw
+
+> Uncomplicated Firewall.
+> Frontend for `iptables` aiming to make configuration of a firewall easier.
+> More information: <https://wiki.ubuntu.com/UncomplicatedFirewall>.
+
+- Enable ufw:
+
+`ufw enable`
+
+- Disable ufw:
+
+`ufw disable`
+
+- Show ufw rules, along with their numbers:
+
+`ufw status numbered`
+
+- Allow incoming traffic on port 5432 on this host with a comment identifying the service:
+
+`ufw allow {{5432}} comment "{{Service}}"`
+
+- Allow only TCP traffic from 192.168.0.4 to any address on this host, on port 22:
+
+`ufw allow proto {{tcp}} from {{192.168.0.4}} to {{any}} port {{22}}`
+
+- Deny traffic on port 80 on this host:
+
+`ufw deny {{80}}`
+
+- Deny all UDP traffic to ports in range 8412:8500:
+
+`ufw deny proto {{udp}} from {{any}} to {{any}} port {{8412:8500}}`
+
+- Delete a particular rule. The rule number can be retrieved from the `ufw status numbered` command:
+
+`ufw delete {{rule_number}}`