Update slack community links (#31)

Author: misraved

README.md

@@ -4,7 +4,7 @@
 
 * **[Get started →](https://hub.steampipe.io/plugins/turbot/zendesk)**
 * Documentation: [Table definitions & examples](https://hub.steampipe.io/plugins/turbot/zendesk/tables)
-* Community: [Slack Channel](https://join.slack.com/t/steampipe/shared_invite/zt-oij778tv-lYyRTWOTMQYBVAbtPSWs3g)
+* Community: [Slack Channel](https://steampipe.io/community/join)
 * Get involved: [Issues](https://github.com/turbot/steampipe-plugin-zendesk/issues)
 
 ## Quick start

docs/index.md

@@ -83,4 +83,4 @@ connection "zendesk" {
 ## Get involved
 
 * Open source: https://github.com/turbot/steampipe-plugin-zendesk
-* Community: [Slack Channel](https://join.slack.com/t/steampipe/shared_invite/zt-oij778tv-lYyRTWOTMQYBVAbtPSWs3g)
+* Community: [Slack Channel](https://steampipe.io/community/join)