update vscode/codespaces config

.vscode/extensions.json

@@ -0,0 +1,13 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=827846
+  // for the documentation about the extensions.json format
+  "recommendations": [
+    "editorconfig.editorconfig",
+    "budparr.language-hugo-vscode",
+    "dbaeumer.vscode-eslint",
+    "davidanson.vscode-markdownlint",
+    "esbenp.prettier-vscode",
+    "stylelint.vscode-stylelint",
+    "ms-vscode.wordcount"
+  ]
+}