changed the URL for community

Author: dino475

quickstart.mdx

@@ -182,5 +182,5 @@ Navigate to your [dashboard settings](https://www.dashboard.mintlify.com/setting
 
 Congrats! You've set up your Mintlify Docs and it's looking amazing! Need
 support or want to give some feedback? You can join our
-[community](https://mintlify.com/community) or drop us an email at
+[community](https://join.slack.com/t/mintlify-users/shared_invite/zt-2ycm40ref-_HaWTg56T~2QdaJMT_dVyA) or drop us an email at
 [[email protected]](mailto:[email protected]).