added twitter account

Author: hagenburger

data/supporters.json

@@ -5,6 +5,7 @@
       "city": "Berlin",
       "country": "Germany",
       "link": "http://www.rug-b.de",
+      "twitter": "rug_b",
       "contacts": [
         {
           "name": "Tobias Pfeiffer",

source/index.html.erb

@@ -13,6 +13,7 @@
         <div class="user group">
           <span class="supporters--item-location"><%= supporter.city %>/<%= supporter.country %></span>
           <%= link_to supporter.link.sub(%r(https?://), ''), supporter.link, class: 'supporters--item-link' %>
+          <%= link_to('@' + supporter.twitter, 'https://twitter.com/' + supporter.twitter, class: 'supporters--item-link') unless supporter.twitter.empty? %>
         </div>
         <ul class="supporters--contacts">
           <% supporter.contacts.each do |contact| %>

source/stylesheets/style.css.scss

@@ -114,6 +114,11 @@
 .supporters--item-link {
   color: #333;
   margin-left: 0.5rem;
+  text-decoration: none;
+
+  &:hover {
+    color: #777;
+  }
 }
 
 .supporters--contacts {