Templates refactoring

Inject HTML directly and fix footer out of main content <div>

templates/email/base.html

@@ -128,7 +128,6 @@ body {
       <div class="content">
         {% block content %}{% endblock %}
       </div>
-    </div>
       <div class="footer">
         <p>
           <strong>zero2prod</strong>
@@ -141,5 +140,6 @@ body {
         </p>
         <p class="unsubscribe">You're receiving this because you subscribed to the zero2prod newsletter.</p>
       </div>
+    </div>
   </body>
 </html>

templates/email/standalone.html

@@ -1,2 +1,2 @@
 {% extends "base.html" %}
-{% block content %}{{ html_content }}{% endblock %}
+{% block content %}{{ html_content|safe }}{% endblock %}