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

tldr/linux/nmcli-networking

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nmcli networking
+
+> Manage the networking status of NetworkManager.
+> This subcommand can also be called with `nmcli n`.
+> More information: <https://networkmanager.dev/docs/api/latest/nmcli.html>.
+
+- Show the networking status of NetworkManager:
+
+`nmcli networking`
+
+- Enable or disable networking and all interfaces managed by NetworkManager:
+
+`nmcli networking {{on|off}}`
+
+- Show the last known connectivity state:
+
+`nmcli networking connectivity`
+
+- Show the current connectivity state:
+
+`nmcli networking connectivity check`