chore(nix): Add direnv config

.envrc

+use flake

.gitignore

 /target
 config.toml
-config.yaml
+config.yaml
\ No newline at end of file
+.direnv

flake.nix

@@ -27,7 +27,7 @@
 
         devShell = pkgs.mkShell {
           buildInputs = with pkgs; [dbus];
-          nativeBuildInputs = with pkgs; [rustc cargo pkg-config];
+          nativeBuildInputs = with pkgs; [rustc cargo rust-analyzer pkg-config];
         };
 
         formatter = nixpkgs.legacyPackages.${system}.alejandra;