✨ Updated dependencies, nix shell, justfile

- Updated all dependencies
- Updated Rust edition to 2024
- Nix shell from flake
- Added justfile
- Mirgrate all changes to various packages

flake.nix

@@ -0,0 +1,38 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { nixpkgs, nixpkgs-unstable, ... }:
+    let
+      system = "x86_64-linux";
+    in
+    {
+      devShells.${system}.default =
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+          };
+          unstable = import nixpkgs-unstable {
+            inherit system;
+          };
+        in
+        pkgs.mkShell {
+          packages = with pkgs; [
+            git
+            just
+          ] ++ [
+            # Rust
+            gcc
+            # cargo
+          ] ++ [
+            # Diesel
+            diesel-cli
+            unstable.libpq
+          ];
+
+          shellHook = "fish";
+        };
+    };
+}