Add Slack channel for community (#297)

Author: Noah Lee

README.md

@@ -55,7 +55,7 @@ For public repositories, we're providing the [free cloud](https://cloud.gitploy.
 
 Documentation | Community | Installation Guide | Docker Image
 --- |--- |--- |---
-📚 [Documentation](https://docs.gitploy.io/) |💬 [Community](https://github.com/gitploy-io/gitploy/discussions) |📖 [Installation Guide](https://docs.gitploy.io/tasks/installation/) |🐋 [Docker Image](https://hub.docker.com/repository/docker/gitployio/gitploy)
+📚 [Documentation](https://docs.gitploy.io/) |❓ [Community](https://github.com/gitploy-io/gitploy/discussions) / 💬 [Slack](https://join.slack.com/t/gitploy/shared_invite/zt-112wz7qtz-HuZXMM_DaEEo1VDdsCUSRg)|📖 [Installation Guide](https://docs.gitploy.io/tasks/installation/) |🐋 [Docker Image](https://hub.docker.com/repository/docker/gitployio/gitploy)
 
 ### Articles
 

docs/faq.md

@@ -6,4 +6,4 @@ Don't worry. Gitploy transit the deployment status into `canceled` if pending (i
 
 ## Questions?
 
-We are always happy to help with questions you might have. Search our documentation or check out answers to common questions. You can also post questions or comments to our [community](https://github.com/gitploy-io/gitploy/discussions).
+We are always happy to help with questions you might have. Search our documentation or check out answers to common questions. You can also post questions or comments to our [community](https://github.com/gitploy-io/gitploy/discussions) or [Slack](https://join.slack.com/t/gitploy/shared_invite/zt-112wz7qtz-HuZXMM_DaEEo1VDdsCUSRg). 

docs/references/configurations.md

@@ -23,9 +23,3 @@ Index of server configuration settings:
 * [GITPLOY_TLS_CERT](./GITPLOY_TLS_CERT.md)
 * [GITPLOY_TLS_KEY](./GITPLOY_TLS_KEY.md)
 * [GITPLOY_WEBHOOK_SECRET](./GITPLOY_WEBHOOK_SECRET.md)
-
----
-
-## Questions?
-
-We are always happy to help with questions you might have. Search our documentation or check out answers to common questions. You can also post questions or comments to our [community](https://github.com/gitploy-io/gitploy/discussions).

docs/tasks/usecases.md

@@ -50,9 +50,3 @@ envs:
     deployable_ref: main
     production_environment: true
 ```
-
-## Questions?
-
-We are always happy to help with questions you might have. You can post questions or comments to our [community](https://github.com/gitploy-io/gitploy/discussions). 
-
-And we are very welcome to share your deployment pipeline at our [community](https://github.com/gitploy-io/gitploy/discussions).