Replace stale Slack invite links in docs

Author: justin808

docs/oss/deployment/troubleshooting.md

@@ -484,7 +484,7 @@ console.log(ReactOnRails.registeredComponents());
 
 - **[GitHub Issues](https://github.com/shakacode/react_on_rails/issues)** - Bug reports and feature requests
 - **[GitHub Discussions](https://github.com/shakacode/react_on_rails/discussions)** - Questions and help
-- **[React + Rails Slack](https://invite.reactrails.com)** - Real-time community support
+- **[React + Rails Slack](https://reactrails.slack.com)** - Real-time community support
 
 ### Professional support
 

docs/oss/getting-started/common-issues.md

@@ -262,5 +262,5 @@ ls -la public/packs/
 1. **Check the detailed [Troubleshooting Guide](../deployment/troubleshooting.md)**
 2. **Search [GitHub Issues](https://github.com/shakacode/react_on_rails/issues)**
 3. **Ask in [GitHub Discussions](https://github.com/shakacode/react_on_rails/discussions)**
-4. **Join [React + Rails Slack](https://invite.reactrails.com)**
+4. **Join [React + Rails Slack](https://reactrails.slack.com)**
 5. **Professional support**: [[email protected]](mailto:[email protected])