Update index.html

Author: vaibhavdaren

index.html

@@ -286,7 +286,7 @@ <h3><a href="#">Join our slack Channel</a></h3>
                                     Don't Wait ,  Connect right now  .
                                     Get united in a common goal  </p>
                         <form>
-    <a href="https://codeuino.slack.com" class="btn btn-danger">Join Us</a>
+    <a href="https://join.slack.com/t/codeuino/shared_invite/enQtMzcxOTQwNzE4NzcxLWEyNzUxYjI0ZThiNWUyYWI5MzJlMTNmODMxN2NjMTcxODJkZmFhNTVkYmUyOTQ1YzgzNTlmMTVkYzVhMzdmNTQ" class="btn btn-danger">Join Us</a>
 
                         </form>
                     </div>
@@ -311,7 +311,7 @@ <h3><a href="#">Engagement Team</a></h3>
                         <p class="author"><img src="images/slack.png"
                                                alt=" "> Works on marketing, outreach, events and websites. It wants your help!</p>
                         <form>
-<a href="https://codeuino.slack.com" class="btn btn-danger">Join Engagement Team</a>
+<a href="https://join.slack.com/t/codeuino/shared_invite/enQtMzcxOTQwNzE4NzcxLWEyNzUxYjI0ZThiNWUyYWI5MzJlMTNmODMxN2NjMTcxODJkZmFhNTVkYmUyOTQ1YzgzNTlmMTVkYzVhMzdmNTQ" class="btn btn-danger">Join Engagement Team</a>
 
                         </form>
                     </div>