Update cheatsheets

nix3-repl

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nix repl
+
+> Start an interactive environment for evaluating Nix expressions.
+> See <https://nixos.org/manual/nix/stable/language/index.html> for a description of the Nix expression language.
+> More information: <https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-repl.html>.
+
+- Start an interactive environment for evaluating Nix expressions:
+
+`nix repl`
+
+- Load all packages from a flake (e.g. `nixpkgs`) into scope:
+
+`:lf {{nixpkgs}}`
+
+- Build a package from an expression:
+
+`:b {{expression}}`
+
+- Start a shell with package from the expression available:
+
+`:u {{expression}}`
+
+- Start a shell with dependencies of the package from the expression available:
+
+`:s {{expression}}`