Slack link on the website is not available

[jchandrashekar333]

The Slack link mentioned on the website is currently not available or accessible.
This PR is raised to report the issue so the link can be fixed or updated.

https://rebuildearth.slack.com/join/shared_invite/zt-3kbpmw94h-kd55zrYf0A_Axgj59zJg5Q#/shared-invite/error

[8sami]

its working now, please check