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

tldr/racket

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# racket
+
+> Racket language interpreter.
+> More information: <https://racket-lang.org>.
+
+- Start a REPL (interactive shell):
+
+`racket`
+
+- Execute a Racket script:
+
+`racket {{path/to/script.rkt}}`
+
+- Execute a Racket expression:
+
+`racket --eval "{{expression}}"`
+
+- Run module as a script (terminates option list):
+
+`racket --lib {{module_name}} --main {{arguments}}`
+
+- Start a REPL (interactive shell) for the `typed/racket` hashlang:
+
+`racket -I typed/racket`