Merge branch '169-add-a-banner-on-the-homepage-to-describe-the-ay-memopol-works' into 'master'

Adding banners to the homepage.

Closes #169

See merge request !176

src/memopol/templates/home.html

@@ -18,6 +18,7 @@
       <p>
         {{ HOMEPAGE_INTRO_TEXT }}
       </p>
+      <img src="{% static "images/banniere_en.png" %}" alt=""/>
       <h2>{% trans "What about this instance ?" %}</h2>
       <p>
         {{ HOMEPAGE_INSTANCE_TEXT }}