feat: Replace Slack mentions with Discourse

Author: alessfg

README.md

@@ -1,6 +1,7 @@
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/nginx/template-repository/badge)](https://securityscorecards.dev/viewer/?uri=github.com/nginx/template-repository)
 [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
 [![Community Support](https://badgen.net/badge/support/community/cyan?icon=awesome)](/SUPPORT.md)
+[![Community Forum](https://img.shields.io/badge/community-forum-009639?logo=discourse&link=https%3A%2F%2Fcommunity.nginx.org)](https://community.nginx.org)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](/CODE_OF_CONDUCT.md)
 
@@ -48,6 +49,7 @@ This template includes all the scaffolding you need to get started on an OSS rep
 [![Project Status: Concept – Minimal or no implementation has been done yet, or the repository is only intended to be a limited example, demo, or proof-of-concept.](https://www.repostatus.org/badges/latest/concept.svg)](https://www.repostatus.org/#concept)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/{{REPOSITORY_OWNER}}/{{REPOSITORY_URL}}/badge)](https://securityscorecards.dev/viewer/?uri=github.com/{{REPOSITORY_OWNER}}/{{REPOSITORY_URL}})
 [![Community Support](https://badgen.net/badge/support/community/cyan?icon=awesome)](/SUPPORT.md) <!-- [![Commercial Support](https://badgen.net/badge/support/commercial/cyan?icon=awesome)](<Insert URL>) -->
+[![Community Forum](https://img.shields.io/badge/community-forum-009639?logo=discourse&link=https%3A%2F%2Fcommunity.nginx.org)](https://community.nginx.org)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](/CODE_OF_CONDUCT.md)
 

SUPPORT.md

@@ -10,17 +10,9 @@ Don't know how something in this project works? Curious if this project can achi
 
 This isn't the right place to get support for NGINX specific questions, but the following resources are available below. Thanks for your understanding!
 
-<!--
-To be replaced with Discourse
+### Community Forum
 
-### Community Slack
-
-We have a community [Slack](https://nginxcommunity.slack.com/)!
-
-If you are not a member, click [here](https://community.nginx.org/joinslack) to sign up. (Let us know if the link does not seem to be working at <[email protected]>!)
-
-Once you join, check out the `#beginner-questions` and `nginx-users` channels :)
--->
+We have a community [forum](https://community.nginx.org/)! If you have any questions and/or issues, try checking out the [`Troubleshooting`](https://community.nginx.org/c/troubleshooting/8) and [`How do I...?`](https://community.nginx.org/c/how-do-i/9) categories. Both fellow community members and NGINXers might be able to help you! :)
 
 ### Documentation