Update slack invite token

Author: sdarwin

slack/index.html

@@ -23,7 +23,7 @@ <h2 class='header text-xl section-title'>
     <p class='text-xxs slack-paragraph'>Choose one of the following to get started:</p>
         <ul>
       <li class='slack-link'>
-        <a class='text-m link' href="https://join.slack.com/t/cpplang/shared_invite/zt-1snzdn6rp-rOUxF3166oz1_11Tr5H~xg" id="reglink" target="_new">I need an invitation to the C++ Slack workspace.</a>
+        <a class='text-m link' href="https://join.slack.com/t/cpplang/shared_invite/zt-37q3ct0r7-tx42tIYnqBX5zbe8KGNkYA" id="reglink" target="_new">I need an invitation to the C++ Slack workspace.</a>
       </li>
       <li class='slack-link'>
         <a class='text-m link' href="https://cpplang.slack.com">I already have a C++ Slack workspace account.</a>
@@ -117,7 +117,7 @@ <h2 class='header text-xl section-title'>
         <a class='text-m link' href="https://slack.com/downloads">Slack Application Downloads</a>
       </li>
       <li id="#who-operates" class='slack-link'>
-        <a class='text-m link' href="https://join.slack.com/t/cpplang/shared_invite/zt-1snzdn6rp-rOUxF3166oz1_11Tr5H~xg">Request an Invitation</a>
+        <a class='text-m link' href="https://join.slack.com/t/cpplang/shared_invite/zt-37q3ct0r7-tx42tIYnqBX5zbe8KGNkYA">Request an Invitation</a>
       </li>
     </ul>
   </section>