🔧 Disable auto-formatting for vscode

Disable vscode's "format on save" feature until we configure the editor to
format files according to the project's styleguide (#215). This prevents
unwanted formatting changes when editing and saving a file in vscode.

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "editor.formatOnSave": false
+}