Update cheatsheets

elvish

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# elvish
+
+> Expressive programming language and a versatile interactive shell.
+> See also: `nu`.
+> More information: <https://elv.sh>.
+
+- Start an interactive shell session:
+
+`elvish`
+
+- Execute specific [c]ommands:
+
+`elvish -c "{{echo 'elvish is executed'}}"`
+
+- Execute a specific script:
+
+`elvish {{path/to/script.elv}}`