Update mission.html

Author: WassCodeur

mission.html

@@ -582,7 +582,7 @@ <h2>
                         tsitsim la me
                         eye nàkpe ɖe mía ŋu le tekinɔlɔdzi ƒe etsɔme ɖoɖo le Togo me.</span>
                 </p>
-                <a href="#" class="cta-button joinus">
+                <a href="https://pytogo.org/discord" class="cta-button joinus">
                     <span data-lang="en">Become a Member</span>
                     <span data-lang="fr">Devenir Membre</span>
                     <span data-lang="tg">Zu Hatɔ</span>