Fix remaining links to old cfp

tdf3/en/index.html

@@ -16,7 +16,7 @@
             <nav class="navigationbar">
                 <a href="index.html" class="nav-button inactive">Main Page</a>
                 <a href="participate.html" class="nav-button">Participate</a>
-                <a href="schedule.html" class="nav-button">Schedule</a>
+                <a href="https://tdf3.schedule.cttue.de/tdf3/schedule/" class="nav-button">Schedule</a>
                 <a href="recap.html" class="nav-button">Recap</a>
             </nav>
 
@@ -69,7 +69,7 @@
                 </div>
                 
                 <div class="button-container">
-                    <a href="https://cfp.cttue.de/tdf3/schedule/" class="button">Schedule</a>
+                    <a href="https://tdf3.schedule.cttue.de/tdf3/schedule/" class="button">Schedule</a>
                 </div>
             </div>