Add the hackertours also to the english website

en/index.html

@@ -23,6 +23,8 @@
             <a href="index.html" class="active">Home</a>
             <a href="https://cfp.cttue.de/tdf5/schedule" class="nav-button" target="_blank"
               rel="noopener noreferrer">Program <span class="fas">&#xf35d;</span></a>
+            <a href="https://pretix.cttue.de/cttue/tdf5-hackertours/" class="nav-button" target="_blank"
+              rel="noopener noreferrer">Hackertours <span class="fas">&#xf35d;</span></a>                    
             <a href="join.html">Participate</a>
             <a href="venue.html">Venue</a>
             <a href="recap.html">Recap</a>
@@ -131,6 +133,15 @@
           </div>
         </div>
 
+        <!-- Hackertours -->
+        <div class="box" id="program">
+          <p>For the first time, we are offering excursions as so-called Hackertours. These include a guided tour through the Landestheater Tübingen and a punting tour (available soon).</p>
+          <div class="button-container">
+            <a href="https://pretix.cttue.de/cttue/tdf5-hackertours/" class="button" target="_blank"
+              rel="noopener noreferrer">Hackertours <span class="fas">&#xf35d;</span></a>
+          </div>
+        </div>
+
         <!-- Join -->
         <div class="box" id="join">
           <p>The Digital Freedom Days are made possible by your participation. Learn more about how you can contribute