Completely integrate wepack in django

* Migrate alpine
* Migrate jquery and jquery-ui
* Migrate shorten
* Add babel for javascript
* Introduce staticfiles django app
* Only bundle -index.js files in static/webpack
* Unify scss and webpack generated files
* Convert scss calls to static
* Add --clear-generated option to collectstatic
* Fix docs warnings

pedagogy/templates/pedagogy/guide.jinja

@@ -6,7 +6,7 @@
 {% endblock %}
 
 {% block additional_css %}
-  <link rel="stylesheet" href="{{ scss('pedagogy/css/pedagogy.scss') }}">
+  <link rel="stylesheet" href="{{ static('pedagogy/css/pedagogy.scss') }}">
 {% endblock %}
 
 {% block head %}
@@ -214,4 +214,4 @@
       }))
     })
   </script>
-{% endblock content %}
+{% endblock content %}