fixed ml link

src/index.hbs

@@ -41,7 +41,7 @@
           <fieldset>
             <legend>JOIN US</legend>
             <label class="text-info">Squatconf's mailing list</label>
-            <a href="https://pad.ijhack.nl/p/squatconf-days" target="_blank">
+            <a href="https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/squatconf" target="_blank">
               <button type="submit" class="btn">Subscribe</button>
             </a>
             <div id="status-msg">&nbsp;</div>