Update cheatsheets

tldr/dotenvx

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dotenvx
+
+> A better `dotenv`, from the creator of `dotenv`.
+> More information: <https://dotenvx.com/docs>.
+
+- Run a command with environment variables from a `.env` file:
+
+`dotenvx run -- {{command}}`
+
+- Run a command with environment variables from a specific `.env` file:
+
+`dotenvx run -f {{path/to/file.env}} -- {{command}}`
+
+- Set an environment variable with encryption:
+
+`dotenvx set {{key}} {{value}}`
+
+- Set an environment variable without encryption:
+
+`dotenvx set {{key}} {{value}} --plain`
+
+- Return environment variables defined in a `.env` file:
+
+`dotenvx get`
+
+- Return the value of an environment variable defined in a `.env` file:
+
+`dotenvx get {{key}}`
+
+- Return all environment variables from `.env` files and OS:
+
+`dotenvx get --all`