Updating the homepage local login form

I deleted the local login form on the homepage and replaced it by a
visual. I updated the CSS stylesheet accordingly.
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/allgo/static/css/allgo.css

@@ -6,6 +6,10 @@ body {
   /* Margin bottom by footer height */
   margin-bottom: 260px;
 }
+.responsive-img {
+  width: 100%;
+  height: auto;
+}
 /*
  * Header
  */
@@ -34,9 +38,6 @@ header {
 .jumbotron .lead {
   font-size: 1.9em;
 }
-.jumbotron .card label {
-  color: #586069;
-}
 .slogan-title {
   font-size: 5em;
 }

django/allgo/templates/home.html

@@ -11,45 +11,16 @@
       <h1 class="slogan-title">A<span class="allgo-pipes">||</span>gorithms at your fingertips</h1>
       <p class="lead slogan">
         A||go is a platform for building and deploying apps that analyze massive
-        data using containers technology. It has been specifically designed for
-        science applications.
+        data. It has been specifically designed for science applications.
       </p>
     </div>
 
-    <div class="col-sm-4 col-md-5">
-          {% if not user.is_authenticated %}
-      <div class="card">
-        <div class="card-body">
-          <form class="signup" id="signup_form" method="post" action="{% url 'account_signup' %}">
-          {% csrf_token %}
-            <div class="form-group">
-              {#  <label for="exampleInputEmail1">Email address</label> #}
-              {{ signup_form.email.label_tag }}
-              {{ signup_form.email | attr:"placeholder:you@example.com" | add_class:"form-control" }}
-              <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
-            </div>
-            <div class="form-group">
-              {{ signup_form.password1.label_tag }}
-              {{ signup_form.password1 | attr:"placeholder:Create a password" | add_class:"form-control"}}
-              <small id="passwordHelp" class="form-text text-muted">Password policy here.</small>
-            </div>
-
-            {% if signup_form.password2 %}
-            <div class="form-group">
-              {{ signup_form.password2.label_tag }}
-              {{ signup_form.password2 | attr:"placeholder:Type your password again" | add_class:"form-control"}}
-            </div>
-            {% endif %}
-
-            {% if redirect_field_value %}
-            <input type="hidden" name="{{ redirect_field_name }}" value="{{ redirect_field_value }}" />
-            {% endif %}
-
-            <button type="submit" class="btn btn-primary btn-block">Sign up for A||GO</button>
-          </form>
-        </div>
-      </div>
-        {% endif %}
+    <div class="col-sm-4 col-md-5 allgo-visual">
+        <a href="{% url 'main:webapp_list' %}"
+          title="Browse the webapps">
+          <img src="{% static 'images/allgo-visual.png' %}"
+          class="responsive-img" alt="Allgo workflow" />
+        </a>
     </div>
   </div>
   </div>