Add instructions for adding a company logo

content/css/docs.css

@@ -195,6 +195,13 @@ body {
   padding-bottom: 10px;
 }
 
+.add-yourself {
+  font-family: 'Lato', sans-serif;
+  font-size: 14px;
+  font-weight: 300;
+}
+
+
 .logos {
   display: flex;
   align-items: center;

content/index.html

@@ -156,5 +156,11 @@ layout: jumbotron
       </div>
     </div>
 
+    <div class="container text-center">
+      <div class="row">
+        <div class="col-md-12 add-yourself">Want to see your logo here? <a href="https://github.com/prometheus/docs/blob/master/content/index.html">File a pull request</a>!</div>
+      </div>
+    </div>
+
   <%= render 'container_footer' %>
 </div>