vscode workspace settings and 2 extra extensions

.vscode/settings.json

@@ -7,4 +7,14 @@
     "editor.guides.highlightActiveBracketPair": true,
     "files.trimTrailingWhitespace": true,
     "sops.defaults.ageKeyFile": "age.key",
+    "nix.enableLanguageServer": true,
+    "nix.serverPath": "/run/current-system/sw/bin/nil",
+    "nix.formatterPath": "/run/current-system/sw/bin/nixpkgs-fmt",
+    "nix.serverSettings": {
+        "nil": {
+            "formatting": {
+              "command": ["nixpkgs-fmt"]
+            }
+          }
+    },
 }

nixos/modules/nixos/editor/vscode.nix

@@ -32,6 +32,8 @@ let
     "fill-labs.dependi"
     "rust-lang.rust-analyzer"
     "dustypomerleau.rust-syntax"
+    "mattheworford.hocon-tools"
+    "pgourlain.erlang"
     # "github.copilot-chat"
   ];
   # Nixpkgs Extensions. These are updated whenver they get around to it.