README.md: #lima channel is now hosted on CNCF Slack

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Author: AkihiroSuda

.github/ISSUE_TEMPLATE/config.yml

@@ -4,5 +4,5 @@ contact_links:
   url: https://github.com/lima-vm/lima/discussions
   about: We use GitHub Discussions for questions, GitHub issues for tracking bug reports and feature requests
 - name: Chat with Lima users and developers
-  url: https://slack.rancher.io/
-  about: Rancher Users slack has `#lima` channel, colocated with `#rancher-desktop` channel (Lima is not a Rancher project)
+  url: https://slack.cncf.io/
+  about: CNCF slack has `#lima` channel

README.md

@@ -53,9 +53,9 @@ GUI:
 
 ### Communication channels
 - [GitHub Discussions](https://github.com/lima-vm/lima/discussions)
-- `#lima` channel, colocated with `#rancher-desktop` channel in Rancher Users Slack (Lima is not a Rancher project)
-  - New account: https://slack.rancher.io/
-  - Login: https://rancher-users.slack.com/
+- `#lima` channel in the CNCF Slack
+  - New account: https://slack.cncf.io/
+  - Login: https://cloud-native.slack.com/
 
 ### Code of Conduct
 Lima follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).