Resolve "Use Select2 everywhere"

Closes #102 (closed)

TODO: Do not load any stuff from external sources.

biscuit/core/templates/core/base.html

@@ -7,6 +7,7 @@
 {% block bootstrap4_extra_head %}
   {% fa_css %}
   {% include_css "DataTables-Bootstrap4" %}
+  {% include_css "Select2" %}
   {% include 'core/icons.html' %}
   <link rel="stylesheet" href="{% sass_src 'bootstrap_modified.scss' %}" />
   <link rel="stylesheet" href="{% static 'css/style.css' %}" />
@@ -17,6 +18,7 @@
 {% block bootstrap4_extra_script %}
   {% include_js "DataTables" %}
   {% include_js "DataTables-Bootstrap4" %}
+  {% include_js "Select2" %}
   <script type="text/javascript" src="{% static 'js/main.js' %}" /></script>
 {% endblock %}