update slack invite link

Signed-off-by: Gabriel Ionescu <gbi@amazon.com>

Author: Gabriel Ionescu

index.html

@@ -139,7 +139,7 @@
             <span>Join our GitHub Community</span>
           </a>
           <a
-            href="https://join.slack.com/t/firecracker-microvm/shared_invite/enQtNDY2NTUwMzQ3MDE1LWIwMzA0OWFkMTZhMTlmMDZiMmFkYjMyODMxMGQ1ZjliMzJjNjJiNWRhNWNkOGEyNmUxNmRkMjZhYTc3MmVjZjM"
+            href="https://join.slack.com/t/firecracker-microvm/shared_invite/zt-oxbm7tqt-GLlze9zZ7sdRSDY6OnXXHg"
             class="css-button sta-hoverOFF"
           >
             <i class="icon-slack" aria-hidden="true"></i>
@@ -344,7 +344,7 @@
               </a>
               . You can chat with others in the community on the
               <a
-                href="https://join.slack.com/t/firecracker-microvm/shared_invite/enQtNDY2NTUwMzQ3MDE1LWIwMzA0OWFkMTZhMTlmMDZiMmFkYjMyODMxMGQ1ZjliMzJjNjJiNWRhNWNkOGEyNmUxNmRkMjZhYTc3MmVjZjM"
+                href="https://join.slack.com/t/firecracker-microvm/shared_invite/zt-oxbm7tqt-GLlze9zZ7sdRSDY6OnXXHg"
               >
                 Firecracker Slack workspace
               </a>
@@ -407,7 +407,7 @@
             <span>Join our GitHub Community</span>
           </a>
           <a
-            href="https://join.slack.com/t/firecracker-microvm/shared_invite/enQtNDY2NTUwMzQ3MDE1LWIwMzA0OWFkMTZhMTlmMDZiMmFkYjMyODMxMGQ1ZjliMzJjNjJiNWRhNWNkOGEyNmUxNmRkMjZhYTc3MmVjZjM"
+            href="https://join.slack.com/t/firecracker-microvm/shared_invite/zt-oxbm7tqt-GLlze9zZ7sdRSDY6OnXXHg"
             class="css-button3 sta-hoverOFF"
           >
             <i class="icon-slack" aria-hidden="true"></i>