docs: add a perm slack invite link (#3035)

* Adding working slack invite link

* docs: update to a permanent link

* update to a perm link

Co-authored-by: Rui Chen <rui@chenrui.dev>

README.md

@@ -6,7 +6,7 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/runatlantis/atlantis.svg)](https://pkg.go.dev/github.com/runatlantis/atlantis)
 [![codecov](https://codecov.io/gh/runatlantis/atlantis/branch/main/graph/badge.svg)](https://codecov.io/gh/runatlantis/atlantis)
 [![CircleCI](https://circleci.com/gh/runatlantis/atlantis/tree/main.svg?style=shield)](https://circleci.com/gh/runatlantis/atlantis/tree/main)
-[![Slack](https://img.shields.io/badge/Join-Atlantis%20Community%20Slack-red)](https://join.slack.com/t/atlantis-community/shared_invite/zt-1l35i8t8k-oqnXuIqyeGpGQJVMWzHoDg)
+[![Slack](https://img.shields.io/badge/Join-Atlantis%20Community%20Slack-red)](https://join.slack.com/t/atlantis-community/shared_invite/zt-1nt7yx7uq-AnVRc_JItF1CDwZtfqv_OA)
 
 <p align="center">
   <img src="./runatlantis.io/.vuepress/public/hero.png" alt="Atlantis Logo"/><br><br>
@@ -23,7 +23,7 @@
 * How to get started: [www.runatlantis.io/guide](https://www.runatlantis.io/guide)
 * Full documentation: [www.runatlantis.io/docs](https://www.runatlantis.io/docs)
 * Download the latest release: [github.com/runatlantis/atlantis/releases/latest](https://github.com/runatlantis/atlantis/releases/latest)
-* Get help in our [Slack channel](https://join.slack.com/t/atlantis-community/shared_invite/enQtNzc4NDM3OTA3ODI0LTA5NDQ4YTA3NTAxM2I3ZmIxMGNiYWJhNmY4YjBjZjM3OWMzNGI0NTcxNzY2NjRhODIyODA4YmNjOTBiOThhNTI)
+* Get help in our [Slack channel](https://join.slack.com/t/atlantis-community/shared_invite/zt-1nt7yx7uq-AnVRc_JItF1CDwZtfqv_OA)
 * Start Contributing: [CONTRIBUTING.md](CONTRIBUTING.md)
 
 ## What is Atlantis?