Enforce VSCode settings for all developers

But continue to allow own launch and other VSCode files per each working
directory.

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+  "[javascript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "editor.codeActionsOnSave": ["source.formatDocument"]
+}