Stub unsubscribe footer

app/views/layouts/mailer.html.erb

@@ -81,6 +81,12 @@
         margin-bottom: 0;
         margin-top: 0;
       }
+      
+      .footer {
+        border-top: 1px solid #ccc;
+        margin-top: 3em;
+        padding-top: 1em;
+      }
 
       .notification {
         margin-top: 1rem;

app/views/mailers/notification/bundle_mailer/notification.html.erb

@@ -3,5 +3,9 @@
     <h1 class="title">Everything since <%= @bundle.starts_at.strftime("%-l%P on %A, %B %-d") %></h1>
     <p class="subtitle">You have <%= link_to pluralize(@notifications.count, "new notification"), notifications_url %>.</p>
     <%= render partial: "notification/bundle_mailer/notification", collection: @notifications, as: :notification %>
+    <p class="footer">Fizzy emails you about new notifications every few hours. <br>
+      <%= link_to "Change how often you get these", settings_notifications_url %> 
+      or <%= link_to "unsubscribe from all email notifications", root_url %>.
+    </p>
   </td>
 </tr>

app/views/mailers/notification/bundle_mailer/notification.text.erb

@@ -2,3 +2,12 @@ Everything since <%= @bundle.starts_at.strftime("%-l%P on %A, %B %-d") %>
 You have <%= pluralize @notifications.count, "new notification" %>.
 
 <%= render partial: "notification/bundle_mailer/notification", collection: @notifications, as: :notification %>
+--------------------------------------------------------------------------------
+
+Fizzy emails you about new notifications every few hours.
+
+Change how often you get these:
+<%= settings_notifications_url %>
+
+Unsubscribe from all email notifications:
+<%= root_url %>