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

tldr/linux/sleep

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sleep
+
+> Delay for a specified amount of time.
+> More information: <https://www.gnu.org/software/coreutils/sleep>.
+
+- Delay in seconds:
+
+`sleep {{seconds}}`
+
+- Delay in [m]inutes. (Other units [d]ay, [h]our, [s]econd, [inf]inity can also be used):
+
+`sleep {{minutes}}m`
+
+- Delay for 1 [d]ay 3 [h]ours:
+
+`sleep 1d 3h`
+
+- Execute a specific command after 20 [m]inutes delay:
+
+`sleep 20m && {{command}}`