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

tldr/linux/systemd-detect-virt

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemd-detect-virt
+
+> Detect execution in a virtualized environment.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemd-detect-virt.html>.
+
+- List detectable virtualization technologies:
+
+`systemd-detect-virt --list`
+
+- Detect virtualization, print the result and return a zero status code when running in a VM or a container, and a non-zero code otherwise:
+
+`systemd-detect-virt`
+
+- Silently check without printing anything:
+
+`systemd-detect-virt --quiet`
+
+- Only detect container virtualization:
+
+`systemd-detect-virt --container`
+
+- Only detect hardware virtualization:
+
+`systemd-detect-virt --vm`