Update cheatsheets

elm

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# elm
+
+> Compile and run Elm source files.
+> More information: <https://elm-lang.org>.
+
+- Initialize an Elm project, generates an elm.json file:
+
+`elm init`
+
+- Start interactive Elm shell:
+
+`elm repl`
+
+- Compile an Elm file, output the result to an `index.html` file:
+
+`elm make {{source}}`
+
+- Compile an Elm file, output the result to a JavaScript file:
+
+`elm make {{source}} --output={{destination}}.js`
+
+- Start local web server that compiles Elm files on page load:
+
+`elm reactor`
+
+- Install Elm package from <https://package.elm-lang.org>:
+
+`elm install {{author}}/{{package}}`