feat: dev shell with nil lsp

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,4 +1,4 @@
-/users/crumb/programs/emacs/eln-cache
+eln-cache
-/users/crumb/programs/emacs/auto-save-list
+auto-save-list
 .direnv
 result

flake.nix

@@ -80,6 +80,12 @@
 
       packages.x86_64-linux.live-minimal =
         self.nixosConfigurations.live-minimal.config.system.build.isoImage;
+
+      devShells.x86_64-linux.default =
+        let pkgs = import inputs.nixpkgs { system = "x86_64-linux"; };
+        in pkgs.mkShell {
+          packages = [ pkgs.nil ];
+        };
     };
 
   nixConfig = {