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

tldr/lex

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lex
+
+> Lexical analyzer generator.
+> Given the specification for a lexical analyzer, generates C code implementing it.
+> Note: on most major OSes, this command is an alias for `flex`.
+> More information: <https://manned.org/lex.1>.
+
+- Generate an analyzer from a Lex file, storing it to the file `lex.yy.c`:
+
+`lex {{analyzer.l}}`
+
+- Specify the output file:
+
+`lex -t {{analyzer.l}} > {{analyzer.c}}`
+
+- Compile a C file generated by Lex:
+
+`c99 {{path/to/lex.yy.c}} -o {{executable}}`