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

tldr/linux/machinectl

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# machinectl
+
+> Control the systemd machine manager.
+> Execute operations on virtual machines, containers and images.
+> More information: <https://www.freedesktop.org/software/systemd/man/machinectl.html>.
+
+- Start a machine as a service using `systemd-nspawn`:
+
+`sudo machinectl start {{machine_name}}`
+
+- Stop a running machine:
+
+`sudo machinectl stop {{machine_name}}`
+
+- Display a list of running machines:
+
+`machinectl list`
+
+- Open an interactive shell inside the machine:
+
+`sudo machinectl shell {{machine_name}}`