📝 Developer environment setup on NixOS (#454)

* 🧑‍💻feat: update nix flake dev environment

- This removes installing `docker`, `rust-analyzer`, `rustfmt`
  imperatively. `nodejs` is used to install dev dependencies
  `stylelint-config-standard` and `postcss-lit`
- The `shellHook`s adds `rusty-hook` CLI to the PATH and the node
  dev dependencies to the NODE_PATH.

* 📝 docs(developing): update NixOS dev environment setup

* fix: remove nonvital guide and improve grammar

---------

Co-authored-by: neon_arch <mustafadhuleb53@gmail.com>

flake.nix

@@ -32,24 +32,32 @@
           buildInputs = [
             actionlint
             cargo
+            docker
             haskellPackages.hadolint
+            nodejs
             nodePackages_latest.cspell
             nodePackages_latest.eslint
             nodePackages_latest.markdownlint-cli2
             nodePackages_latest.stylelint
             redis
             rustPackages.clippy
+            rust-analyzer
             cargo-watch
             rustc
+            rustfmt
             yamllint
             openssl
             pkg-config
           ];
           RUST_SRC_PATH = rustPlatform.rustLibSrc;
+          shellHook = ''
+            export PATH="$PATH:$HOME/.cargo/bin"
+            export NODE_PATH="$NODE_PATH:./node_modules"
+          '';
         };
 
       # Build via "nix build .#websurfx", which is basically just
       # calls the build function
       packages.websurfx = packages.default;
     });
-}
+