Use prettier to format other files

+ Add vscode settings to automatically use it.

.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+  "editor.formatOnSave": true,
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": true
+  }
+}