Add devshell

.envrc

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+use flake .

.gitignore

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+# Zola
+themes/
+
+# Nix
+.direnv/
+result

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1760524057,
+        "narHash": "sha256-EVAqOteLBFmd7pKkb0+FIUyzTF61VKi7YmvP1tw4nEw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "544961dfcce86422ba200ed9a0b00dd4b1486ec5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    { nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        packages = [ pkgs.zola ];
+      };
+
+      formatter.${system} = pkgs.nixfmt-tree;
+    };
+}