Add a prototype email template

If the templates page contains text messages and emails then there’s two ways it
could be structured:
- into two sections, all text messages first, then all emails
- emails and text messages interleaved, sorted by date

I think the second one is better. Imagine a situation where you mostly do emails
but have a few text messages. You’d have to scroll past the text messages to get
to your emails. Every time.

I reckon that the most commonly accessed templates will be the most recent ones.

app/templates/components/sms-message.html

@@ -1,9 +1,10 @@
 {% macro sms_message(body, recipient=None, name=None, edit_link=None) %}
   {% if name %}
     <h3 class="sms-message-name">
-      {{ name }}
       {% if edit_link %}
-        <a href="{{ edit_link }}">Edit</a>
+        <a href="{{ edit_link }}">{{ name }}</a>
+      {% else %}
+        {{ name }}
       {% endif %}
     </h3>
   {% endif %}