Move pages under tldr, lint run.sh, update docs

tldr/nix-env

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nix-env
+
+> Manipulate or query Nix user environments.
+> More information: <https://nixos.org/manual/nix/stable/#sec-nix-env>.
+
+- List all installed packages:
+
+`nix-env -q`
+
+- Query installed packages:
+
+`nix-env -q {{search_term}}`
+
+- Query available packages:
+
+`nix-env -qa {{search_term}}`
+
+- Install package:
+
+`nix-env -iA nixpkgs.{{pkg_name}}`
+
+- Install a package from a URL:
+
+`nix-env -i {{pkg_name}} --file {{example.com}}`
+
+- Uninstall package:
+
+`nix-env -e {{pkg_name}}`
+
+- Upgrade one package:
+
+`nix-env -u {{pkg_name}}`
+
+- Upgrade all packages:
+
+`nix-env -u`