Move some links to their own templates

src/pretix/base/templates/pretixbase/email/email_footer.html

@@ -0,0 +1,6 @@
+{% load i18n %}
+{% with 'target="blank" href="https://pretix.eu"'|safe as a_attr %}
+    {% blocktrans trimmed %}
+        powered by <a {{ a_attr }}>pretix</a>
+    {% endblocktrans %}
+{% endwith %}

src/pretix/base/templates/pretixbase/email/plainwrapper.html

@@ -163,11 +163,7 @@
         <tr>
             <td class="footer">
                 <div>
-                    {% with 'target="blank" href="https://pretix.eu"'|safe as a_attr %}
-                        {% blocktrans trimmed %}
-                            powered by <a {{ a_attr }}>pretix</a>
-                        {% endblocktrans %}
-                    {% endwith %}
+                    {% include "pretixbase/email/email_footer.html" %}
                 </div>
             </td>
         </tr>

src/pretix/control/templates/pretixcontrol/base.html

@@ -224,6 +224,7 @@
                                 {% endfor %}
                             {% endblock %}
                         </ul>
+                        {% include "pretixcontrol/base_after_nav.html" %}
                     </div>
                 </div>
             </nav>

src/pretix/static/pretixcontrol/scss/main.scss

@@ -322,3 +322,13 @@ body.loading #wrapper {
         color: white;
     }
 }
+
+.sidebar-content {
+    text-align: center;
+    padding: 10px 0;
+    font-size: 12px;
+
+    img {
+        max-width: 80%;
+    }
+}