updates readme (#76)

Co-authored-by: Adam Cimarosti <cimarosti@gmail.com>

Author: goodroot

README.md

@@ -70,9 +70,9 @@ To get started, read the language-specific guides.
 ## Community
 
 If you need help, have additional questions or want to provide feedback, you
-may find us on [Slack](https://slack.questdb.io).
+may find us on our [Community Forum](https://community.questdb.io/).
 
-You can also [sign up to our mailing list](https://questdb.io/community/)
+You can also [sign up to our mailing list](https://questdb.io/contributors/)
 to get notified of new releases.
 
 ## License