Update join.html (#40)

@andyblarblar 
+ WhatsApp Link Added
+ Made all buttons filled in

join.html

@@ -58,9 +58,9 @@ <h2>We are happy you are interested!</h2>
 					<footer class="major">
 						<ul class="actions special">
 							<li><a href="https://docs.google.com/forms/d/e/1FAIpQLSf5ulHvRRaSdgtxQD_LSaiKm2nc7HFSDStWzFkiqKGdO2BPvg/viewform?usp=sf_link" class="button primary">Interest Form</a></li>
-							<li><a href="https://discord.gg/rFYJDWbCYq" class="button">Discord</a></li>
-							<li><a href="https://umdearborn.campuslabs.com/engage/organization/isc" class="button">Victor's Link</a></li>
-							<li><a href="https://www.whatsapp.com/" class="button">WhatsApp</a></li>
+							<li><a href="https://umdearborn.campuslabs.com/engage/organization/isc" class="button primary">Victor's Link</a></li>
+							<li><a href="https://discord.gg/rFYJDWbCYq" class="button primary">Discord</a></li>
+							<li><a href="https://chat.whatsapp.com/FL9xY0UtAyZKu69QgqrbsG" class="button primary">WhatsApp</a></li>
 						</ul>
 					</footer>
 					</section>