Chore: Correct the questions link (#41)

* link to posthog forum

README.md

@@ -107,4 +107,4 @@ replace github.com/posthog/posthog-go => /path-to-your-local/posthog-go
 
 ## Questions?
 
-### [Join our Slack community.](https://join.slack.com/t/posthogusers/shared_invite/enQtOTY0MzU5NjAwMDY3LTc2MWQ0OTZlNjhkODk3ZDI3NDVjMDE1YjgxY2I4ZjI4MzJhZmVmNjJkN2NmMGJmMzc2N2U3Yjc3ZjI5NGFlZDQ)
+### [Visit the community forum.](https://posthog.com/questions)