docs: Convert slack links to CNCF, add link to contributing guide (#57)

* docs: Convert slack links to CNCF, add link to contributing guide

Signed-off-by: [email protected] <[email protected]>

Author: vishwa-uber

CONTRIBUTING.md

@@ -1,5 +1,9 @@
 # CONTRIBUTING
 
+For general contributing guidelines and processes shared across all Cadence repositories, please see the [Cadence Contributing Guide](https://github.com/cadence-workflow/cadence/blob/master/CONTRIBUTING.md).
+
+This document contains specific instructions for contributing to the Cadence Helm Charts repository.
+
 ## Build and generate template yml locally
 
 ```bash

README.md

@@ -211,7 +211,10 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for instructions on how to contribute, ru
 
 ## Support
 
-For issues, questions, or contributions, please visit:
-- [GitHub Issues](https://github.com/uber/cadence-charts/issues)
-- [Cadence Documentation](https://cadenceworkflow.io/docs/get-started)
-- [Cadence Community](https://github.com/cadence-workflow/cadence)
+## Community & Support
+
+- **Documentation**: [Cadence Documentation](https://cadenceworkflow.io/docs/)
+- **Community Chat**: Join our [CNCF Slack](https://communityinviter.com/apps/cloud-native/cncf) and find us in the `#cadence` channel
+- **Contributing**: See [CONTRIBUTING.md](CONTRIBUTING.md) for instructions on how to contribute, run samples etc.
+- **Issues**: Report bugs and request features via [GitHub Issues](https://github.com/cadence-workflow/cadence-charts/issues)
+