Update cheatsheets

scheme

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# scheme
+
+> MIT Scheme language interpreter and REPL (interactive shell).
+> More information: <https://www.gnu.org/software/mit-scheme>.
+
+- Start a REPL (interactive shell):
+
+`scheme`
+
+- Run a scheme program (with no REPL output):
+
+`scheme --quiet < {{script.scm}}`
+
+- Load a scheme program into the REPL:
+
+`scheme --load {{script.scm}}`
+
+- Load scheme expressions into the REPL:
+
+`scheme --eval "{{(define foo 'x)}}"`
+
+- Open the REPL in quiet mode:
+
+`scheme --quiet`