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

tldr/vimtutor

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# vimtutor
+
+> Vim tutor, teaching the basic vim commands.
+> See also: `vim`, `vimdiff`, `nvim`.
+> More information: <https://manned.org/vimtutor>.
+
+- Launch the vim tutor using the given language (en, fr, de, ...):
+
+`vimtutor {{language}}`
+
+- Exit the tutor:
+
+`<Esc> :q <Enter>`