Update cheatsheets

tldr/nix-develop

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nix develop
+
+> Run a Bash shell that provides the build environment of a derivation.
+> More information: <https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-develop.html>.
+
+- Start a shell with all dependencies of a package from nixpkgs available:
+
+`nix develop {{nixpkgs#pkg}}`
+
+- Start a development shell for the default package in a flake in the current directory:
+
+`nix develop`
+
+- In that shell, configure and build the sources:
+
+`configurePhase; buildPhase`