Remove legacy files from SchoolApps merge

This removes all files that are left over from the original SchoolApps code. ALl of them contain either code that was replaced by a new implementation, merged completely, or depends too tightly on legacy architecture to be of any further use.

As always, everything needed later can still be recovered from Git.

aleksis/core/dashboard/templates/dashboard/index.html

-{% load staticfiles %}
-{% include 'partials/header.html' %}
-
-<main>
-    <script>
-        var API_URL = "{% url "api_information" %}";
-        var MY_PLAN_URL = "{% url "timetable_my_plan" %}";
-    </script>
-    <script src="{% static "js/moment-with-locales.min.js" %}"></script>
-    {% include "components/react.html" %}
-    <script src="{% static "js/dashboard.js" %}"></script>
-
-    <div id="dashboard_container">
-
-    </div>
-</main>
-
-{% include 'partials/footer.html' %}