feat: use django-hijack to switch user accounts

Resolves #74

breccia_mapper/templates/base.html

@@ -27,6 +27,10 @@
     {% load staticfiles %}
     <link rel="stylesheet" href="{% static 'css/global.css' %}">
 
+    <link rel="stylesheet"
+          type="text/css"
+          href="{% static 'hijack/hijack-styles.css' %}" />
+
     {% if 'javascript_in_head'|bootstrap_setting %}
         {% if 'include_jquery'|bootstrap_setting %}
             {# jQuery JavaScript if it is in head #}
@@ -144,6 +148,9 @@
             </div>
         {% endif %}
 
+        {% load hijack_tags %}
+        {% hijack_notification %}
+
         {% if request.user.is_authenticated and not request.user.has_person %}
             <div class="alert alert-info rounded-0" role="alert">
                 <p class="text-center mb-0">