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

tldr/linux/snake4

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# snake4
+
+> Snake game in the terminal.
+> More information: <https://manpages.debian.org/latest/snake4/snake4.6.en.html>.
+
+- Start a snake game:
+
+`snake4`
+
+- Choose level:
+
+`{{1|2|3|4|5}}`
+
+- Navigate the snake:
+
+`{{Up|Down|Left|Right arrow key}}`
+
+- Pause game:
+
+`<Spacebar>`
+
+- Quit game:
+
+`q`
+
+- Show the high scores:
+
+`snake4 --highscores`