Debugging twig templates

twig-rebug.twig

Some usefull tips to debug in templates:

```twig
{{ dump(_context) }}
{{ dump(_context|keys) }}
{{ dump(myProductQuery.rawSQL()) }}
```

If you ever lose the overview of what template is used at what url, you can use this snippet in each template to show the template name as a regular html comment.

```twig
{% if craft.app.config.general.devMode %}
<!-- Template: {{ _self }} -->
{% endif %}
```