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

tldr/linux/ip

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ip
+
+> Show/manipulate routing, devices, policy routing and tunnels.
+> Some subcommands such as `ip address` have their own usage documentation.
+> More information: <https://www.man7.org/linux/man-pages/man8/ip.8.html>.
+
+- List interfaces with detailed info:
+
+`ip address`
+
+- List interfaces with brief network layer info:
+
+`ip -brief address`
+
+- List interfaces with brief link layer info:
+
+`ip -brief link`
+
+- Display the routing table:
+
+`ip route`
+
+- Show neighbors (ARP table):
+
+`ip neighbour`
+
+- Make an interface up/down:
+
+`ip link set {{interface}} {{up|down}}`
+
+- Add/Delete an IP address to an interface:
+
+`ip addr add/del {{ip}}/{{mask}} dev {{interface}}`
+
+- Add a default route:
+
+`ip route add default via {{ip}} dev {{interface}}`