Fix the link to Kyma Slack channels (#897)

README.md

@@ -42,7 +42,7 @@ Go the [Kyma blog](https://kyma-project.io/blog/) to read the latest news on our
 
 ## Slack
 
-If you prefer even more direct contact, use one of the available [Slack channels](http://slack.kyma-project.io/). Feel free to write to us with any questions, concerns, or ideas for improvement. Any constructive feedback or criticism is welcome.
+If you prefer even more direct contact, use one of the available [Slack channels](https://kyma-community.slack.com/). Feel free to write to us with any questions, concerns, or ideas for improvement. Any constructive feedback or criticism is welcome.
 
 # <img src="assets/technical-support-icon.svg" width="120"> Technical Support
 

docs/README.md

@@ -38,7 +38,7 @@ Subscribe to our [YouTube channel](https://www.youtube.com/channel/UC8Q8bBtYe9gQ
 
 ## Slack
 
-If you prefer even more direct contact, use one of the available [Slack channels](http://slack.kyma-project.io/). Feel free to write to us with any questions, concerns, or ideas for improvement. Any constructive feedback or criticism is welcome.
+If you prefer even more direct contact, use one of the available [Slack channels](https://kyma-community.slack.com/). Feel free to write to us with any questions, concerns, or ideas for improvement. Any constructive feedback or criticism is welcome.
 
 # <img src="assets/technical-support-icon.svg" width="120"> Technical Support
 

docs/guidelines/releases-guidelines/05-release-communication.md

@@ -19,7 +19,7 @@ At the beginning of the release process, the team responsible for the release pi
 
 ## Communication Channels
 
-The Release Manager must notify the Kyma team about the planned dates of creating both release candidates, as well as the date of the final release. Apart from that, the Release Master must inform about the progress of the release process. After the release is out, the Release Master sends notification about the new release on the public **release** [Slack](http://slack.kyma-project.io/) channel.
+The Release Manager must notify the Kyma team about the planned dates of creating both release candidates, as well as the date of the final release. Apart from that, the Release Master must inform about the progress of the release process. After the release is out, the Release Master sends notification about the new release on the public **release** [Slack](https://kyma-community.slack.com/) channel.
 
 ## Communication Persons